Some allow very specific molecules to pass, even against their concentration gradient. Others work as a one way control. Others let many things go through role do membrane proteins play in transporting only certain substances into a cell.
A molecule is two or more atoms held together by chemical bonds that form the smallest unit of matter that holds its composition and properties. Molecules shape the idea of chemistry. Molecules are marked with element symbols and atomic number subscripts. Atoms are the fundamental devices of elements. They consist of an atomic nucleus and surrounding electrons.
If an atom has an incomplete electron cell, it is said to have valence electrons. When two or more atoms come together to share their outer shell valence electrons, they form a chemical (covalent) bond and enter a lower energy state. When atoms combine, energy is released in an exothermic reaction. When a covalent bond is broken and the molecule splits, an energy input is required, thus making it endothermic.
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when we view a stimulus with a specific property, neurons tuned to that property fire and will eventually become fatigued, an effect called adaptation.
Selective adaptation is when we view a stimulus with a specific property, and the neurons tune to that property fire, eventually becoming fatigued.
Neurons tune to a particular attribute fire when we see a stimulus with that property; over time, this firing fatigues the neurons or causes them to adapt. The neuron's firing rate drops due to this adaptation and fires less often when the same stimulus is provided to it again right away.
For instance, a page of plain black text on a white backdrop will undoubtedly capture your attention and make it easier for you to identify important information. However, if you keep viewing pages and pages of mainly neon pink highlights, you'll probably grow accustomed to them, and they will eventually stop drawing your attention.
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research with split-brain patients led michael gazzaniga to conclude that the typically constructs the theories people offer to explain their own behaviors. please choose the correct answer from the following choices, and then select the submit answer button. answer choices somatic nervous system left cerebral hemisphere right cerebral hemisphere autonomic nervous system
Left cerebral hemisphere
Michael Gazzaniga and Roger Sperry carried out the Split-Brain investigation. When Sperry and Ronald Myers discovered that each hemisphere functioned independently as if it were a full brain after the two hemispheres were excised, this discovery served as the impetus for the investigation (Gazzaniga). Prior to doing the study, the researchers' knowledge of the subject was based on Sperry and Myers' discovery, findings from studies of animals, and accounts of people who had had "brain-splitting" surgery. The goal of the study was to see if, in individuals with epilepsy who had had surgery, the hemispheres could function independently of one another when they were divided.
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in trying to determine whether a fossil is a human ancestor, we should always look for traits that make us human today.
Trying to determine whether a fossil is a human ancestor, we should always look for skeleton or bone that make us human today.
What is bone?Bone is a connective tissue which is metabolically active and the main function of bone is to provide mechanical or structural support as well as perform movement, and protect important organs of the body.
The bone is made up of bone cells known as osteocytes and extracellular matrix. The total number of bone human body contain is 206 bones including bones of spine, legs, arms, ribs, and skull.
Bones are made up of calcium and carbonate and they have bone marrow in which blood cells are produced. By nature bones came in category of living and they are active tissue .
There are several types of bones such as flat bones, short bones, sesamoid bones, and long bones. The function of bone is to protect vital organs of the body.
Therefore, trying to determine whether a fossil is a human ancestor, we should always look for skeleton or bone that make us human today.
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a mutation in the dna that changes the sequence of a codon but does not change the amino acid sequence of the protein describes a .
A mutation that affects only the DNA sequence and not the amino acid sequence is known as a silent mutation. Introns, which are spliced off prior to translation, are susceptible to silent mutations.
Several mutagens, or compounds that alter the DNA sequence, can generate silent mutations, Mutations are caused by living things or processes that support life. For example, certain viruses insert copies of their genetic code into the DNA of their hosts. Silent mutations are typically not the outcome of such extensive change.
Chemical mutagens are chemicals that interact with DNA to chemically change the nucleotides.
Base analogues are substances that resemble nucleotide bases structurally. These may result in base-pair mismatches that are integrated into the DNA sequence of the mutation, leading to silent (and other) mutations.
High-energy radiation that physically alters or breaks the DNA strand is known as a physical mutagen.
Thymine dimers, which are created by UV exposure, disrupt DNA replication and cause further errors. Silent mutations are not usually produced by this.
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In humans, mitochondrial genetic disorders are inherited from only the mother. The severity of such diseases can vary greatly, even within a single family. What form of inheritance does this represent?.
The form of inheritance represented by mitochondrial genetic disorders is cytoplasmic inheritance.
The cell contains several cell organelles like mitochondria, chloroplast, Golgi apparatus, endoplasmic reticulum, etc.
Among the organelles present inside the cell, mitochondria and chloroplast are the two organelles that contain their own DNA.
During fertilization, the fusion of sperm and the ovum takes place to form the zygote.
The majority of the cytoplasm present inside the zygote is from the maternal cytoplasm i.e., the ovum. The paternal contribution to the zygote’s cytoplasm is negligible.
Therefore, if any disorder occurs in the maternal mitochondrial DNA, it will get inherited by the offspring.
As the mitochondria are present in the cytoplasm of the cell, the inheritance of mitochondrial traits is known as cytoplasmic inheritance.
Hence, the form of inheritance represented by mitochondrial genetic disorders is cytoplasmic inheritance.
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you discover a new microbe while working on a citizen scientist project. the microbe is taken to a lab that specializes in placing organisms in their correct phylogenic niche. in order to determine its evolutionary relatedness to other microbes, the lab carries out
SSU rRNA analysis
Arbuscular mycorrhizal (AM) fungus are members of the order Glomales and are difficult to distinguish by hyphal morphology. The fungus present in the host or soil may be effectively identified using PCR. On a few sequences of a variable region in the SSU rRNA gene, several of the primers that have been utilized were developed. We analyzed 51 partial Glo males SSU rRNA gene sequences from 33 glomalean isolates to confirm the specificity of primers of this kind that have been utilized in previous studies and to offer data for future primer design.
Each DNA was confirmed by phylogenetic studies in order to differentiate pollutants from the AM fungus (AMF). 39 species were represented in the 88 sequences from 58 isolates that were analyzed together with sequences from the EMBL database.
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monogamous behavior is characteristic of which of these primate species? a. chimpanzee b. orangutan c. gibbon d. baboon
Monogamous behavior is characteristic of the primate species: (c) gibbon.
Monogamous behavior is where a single male and a single female mate only with each other. They do not have multiple partners. This behavior is observed between organisms within the same species. This behavior is observed in swans, birds, gibbons, bats, etc.
Primate is an order of the class Mammalia. They are characterized by larger brains, slow growth, long lifespan and few number of offspring. Primate possesses the most intellectual organisms. Their hands are meant for grasping and have great extent of movement in their shoulders. The examples are: humans, apes, lorises, etc.
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the loss of tooth substance by a chemical process that does not involve known bacterial action is known as: group of answer choices erosion. attrition. bruxism. enamel hyperplasia.
The correct answer is Option A) Erosion.
When there is a loss of tooth substance due to a chemical process that does not involve bacterial action it is known as erosion.
What is erosion of teeth?Dental erosion or tooth erosion is the chemical loss of mineralized tooth substances which is caused due to exposure to acids which is not derived from oral bacteria.
There are two ways of fixing tooth erosion:
Tooth Bonding: In the milder cases of enamel erosion, bonding can be used. Here, it is a cosmetic procedure and a resin which matches the teeth is applied to the damaged tooth. It is later polished and trimmed to fit the mouth.Tooth Crowns: In severe cases of dental erosion, dental crowns are preferred. It involves capping the tooth with a new one in order to protect the damaged teeth.To know more about dental erosion, visit:
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which characteristic helps distinguishes deuterostomes from protostomes? group of answer choices embryological origin of the mouth from blastopore ability to form a blastopore mesodermal migration ectodermal appendages
The characteristic that helps distinguish deuterostomes from protostomes is (a) embryological origin of the mouth from blastopore.
Deuterostomes are the organisms in which the mouth develops from the opening other than the blastopore (the first opening). In deuterostomes the anus forms from the blastopore. The example of deuterostomes is: vertebrates (and thus humans), sea stars, and crinoids.
Protostomes are the organisms in which the mouth develops from the blastopore. Their anus is formed after the formation of mouth. Examples are: arthropods, molluscs, annelids, flatworms and nematodes. Both protostomes and deuterostomes have a common ancestor called Ediacaran, a worm-like aquatic animal.
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How are scientific inferences are drawn from scientific observations? Provide examples from your lab work and what you've learned about cells.
Inference is what we draw from observations, whereas observation is what we perceive when something occurs. Hence they are interrelated.
What are Observation and Inference?An observation is a practice of observing someone or something closely while it's happening and learning from it. Inference is the process of drawing a reasonable conclusion from known facts or conditions.Based on firsthand experience, observation is made. Unlike inference, which is predicated on known facts.Example from lab work:
To ensure that all the starch is consumed, place a healthy potted plant in a dark room for 48 hours.Now, secure one of the plant's leaves with a paper clip to a black piece of paper.For around six hours, keep this plant in direct sunshine.Pick the uncovered and covered leaves off the plant, respectively.The leaves should be briefly submerged in boiling water.Now submerge the leaves in an alcohol-filled beaker.Put this beaker carefully in a water bath and heat it until the alcohol starts to boil.Take note of the solutions and leaves colors. With lots of fresh water, wash the leaves.Now soak the leaves for a few minutes in the iodine solution.Compare the observations of the color of the leaves.Observation:
Alcohol solution turns green when leaves are boiled in it, while the leaves lose their color.When iodine solution is applied to leaves, (a) a leaf coated in black paper did not exhibit any color changes. (b) Another leaf that wasn't coated in black paper turned blue-black when dipped in diluted iodine solution.Inference:
Starch is created by plants during photosynthesis.Since the leaf cannot receive sunlight when it is covered, no starch was created in the leaf.Iodine solution turns blue-black when starch is included. Iodine solution was applied to the covered leaf, but no color change was noticed. It means that this leaf did not produce any starch.The exposed leaf received sunshine for six hours, but when iodine solution was applied, the color turned blue-black.This demonstrates that photosynthesis depends on sunshine.To know more about observation and inference visit:
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A student performed an experiment to see if water temperature affects the level of activity in aquatic snails. The student set up four tanks with five snails in each tank. All four of the setups were identical in every way, except for the temperature of the water. In order to make the conclusions more valid, the student could.
In order to make the conclusions more valid, the student could use a large number of snails.
The accuracy and validity of a research's findings are influenced by the size of the sample taken from the population of interest. The following method for calculating sample size to be selected during a research can be used to calculate the influence of sample size:
(Z - score)² × SD × (1 - SD) / ME² = Sample size
Where Z-score ⇒ confidence level
SD ⇒ Pre-determined standard deviation
ME ⇒ Margin of error.
The sample size has an inverse relationship with the margin of error. As a result, the error margin decreases as the sample size increases and vice versa.
By using more snail samples in each of the tanks, the student might have improved the validity of the research's findings.
Therefore, using a larger number of snails would improve the conclusion. This is because the quantity of snails tested raises the validity of a research report. The validity of the claim is higher and more credible if 10 snails rather than 5 are more active in warmer water.
Thus, option 4 is the right answer.
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A student performed an experiment to see if water temperature affects the level of activity in aquatic snails. The student set up four tanks with five snails in each tank. All four of the setups were identical in every way, except for the temperature of the water. In order to make the conclusions more valid, the student could:__________
(1) alter the pH of the water
(2) change the size of the tank
(3) carry out the experiment for a shorter period of time
(4) use a larger number of snails
Your little brother found a strange object and brings it to you in a jar.
he is sure it is alive, describe three scientific observations you could
make to help you decide whether it's a living organism or not.
Answer:
Is it moving?
Is it breathing (the movements became slower because there's more carbon dioxide in there now)?
Is it eating? (Give it a fruit or a vegetable or a meat)
each of the main types of biological macromolecules (proteins, nucleic acids, carbohydrates, and lipids) are polymers of specific types of monomers.
Each of the main types of biological macromolecules is polymers of specific types of monomers. It is a correct statement.
What are biomolecules?Biomolecules usually referred to as biological molecules, are among the various compounds made by organisms that live on carbohydrates. These biomolecules come in a plethora of shapes and sizes. They also carry out a variety of tasks. Lipids, carbohydrates, proteins, and nucleic acids are the four main categories of biomolecules.
Nucleic acids form acids from the genetic material of the organisms. Carbohydrates and fats are used for the synthesis of energy. Proteins are used for structural and functional roles in the body.Therefore, this is a correct statement.
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4. Tay-Sachs is a recessive inherited disorder. Cross one carrier for the Tay-Sachs allele with one who is not a carrier.
provide a Punnett Square and write out the genotype and phenotype probabilities of the offspring.
Tay-Sachs sickness is resulting from a trouble in a infant's genes which means their nerves prevent running properly. A infant can handiest have it if each mother and father have this defective gene.
Ay–Sachs sickness is resulting from a genetic mutation withinside the HEXA gene on chromosome 15, which codes shape a subunit of the hexosaminidase enzyme called hexosaminidase . It is inherited from a person's mother and father in an autosomal recessive manner.As the sickness progresses, improvement slows and muscle tissue start to weaken.
Over time, this ends in seizures, imaginative and prescient and listening to loss, paralysis, and different fundamental issues. Children with this shape of Tay-Sachs sickness normally stay only some years.This circumstance is inherited in an autosomal recessive pattern , because of this that each copies of the gene in every mobileular have variants.
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Brainless to the best answer.
Are meteorites renewable? If so in what way?
why does a fever become dangerous to body functions if it continues to rise? why does a fever become dangerous to body functions if it continues to rise? dehydration will occur. proteins become denatured and are unable to complete their jobs. osmosis may be affected due to lack of water. a fever breaking is more dangerous than the fever itself.
A fever can become dangerous to body functions if it continues to rise because: the proteins become denatured and are unable to complete their jobs.
Fever is the physiological condition of the body where the body temperature is higher than normal. The normal temperature of the body is around 98.6°F. If the temperature rises above 99°F, then the body can be said to be in a state of fever.
Proteins are the polymers of amino acids. These are the most important macromolecules that perform major of the functions and reactions in the body. Protein can only work in a specific form of structure and if that structure is ruptured the protein is said to be denatured.
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A Ornithologist is a bird expert.
Cellular respiration is an exothermic reaction and photosynthesis is an endothermic reaction. How does the required activation energy compare for these two reactions?.
The required activation energy compare for the two reactions is that (D) Cellular respiration needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Chlorophyll absorbs energy from light (photons/quanta) to create ATP molecules in the process of photosynthesis, which is primarily an intricate endothermic mechanism. Both the creation of glucose and oxygen is aided by them.
In contrast to photosynthesis, respiration takes place in specialized organelles called mitochondria and is an exothermic activity. Numerous enzymes break down glucose in this step to generate energy that is then combined with ATP Synthase to create ATP molecules.
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Question correction:
Cellular respiration is an exothermic reaction and photosynthesis is an endothermic reaction. How does the required activation energy compare for these two reactions?
A. Photosynthesis needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
B. Cellular respiration needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
C. Photosynthesis needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
D. Cellular respiration needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Structured questions
In an experiment on the action of the enzyme amylase, equal volumes of enzyme and starch
solution were mixed. The quantity of maltose (product) was measured during two separate
experiments, one at 18 °C, the other at 25 °C. The results are shown in the graph below.
1.
a.
b.
C.
quantity of maltose produced
(arbitrary unit)
12.
10-
8.
0 2 4
6
25 °C
18 °C
8 10 12 14 16 18
time (min)
Explain why the quantity of maltose produced eventually levelled off at both
temperatures.
[1 mark]
Explain why, at 4th minute time, more maltose had been produced at 25 °C than at 18 °C.
[4 marks]
In terms of the properties of enzyme, explain why amylase is the only enzyme that breaks
down starch.
[1 mark]
1) The levelling is due to the attainment of saturation point
2) The production of more maltose show that 25 °C is the optimum temperature of the enzyme.
What is an enzyme?An enzyme is a biological catalyst that see to the speeding up of the chemical reactions that occur in the body. Recall that an enzyme must be specific in its action. This implies that no two enzymes are able to catalyze the same reaction. The owes largely to the fact that the enzyme fits with the substrate in a lock and key model.
Let us recall that us recall that an enzyme does have an optimum temperature at which it functions, At the optimum temperature of the enzyme, the productivity of the enzyme is highest.
It then follows that;
1) The enzymes level off in the both curves because it has reached the saturation point.
2) The at 4th minute time, more maltose had been produced at 25 °C than at 18 °C because 25 °C is the optimum operating temperature of maltose
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Which of the following isn’t one of the eight characteristics of life?
A) Homeostasis
B) growth
C) movement
D) using energy and resources
Answer: c)movement
Explanation:
since cells are filled with water, what would happen to biologically important molecules if they were held together with ionic bonds?
Ionic bonding involves electrostatic interactions between oppositely charged ions, and can significantly enhance the binding strength of biomolecules immobilized to materials.
A chemical link known as an ionic bond occurs when an electron is transferred from one atom to another. Ionic bonding requires the presence of an electron acceptor and an electron donor, which is frequently a metal (often a nonmetal). Electrovalence is the process of moving electrons. A positive ion, also known as a cation, is created when an atom loses one or more electrons. The other atom that picks up one or more electrons will change into a negative ion known as an anion. The elemental name is modified by adding a -ide at the end to designate the ion that accepts the electron. For instance, the name of the anion of chlorine is chloride while the anion of sulfur is sulfide.
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matthew j. everly. cardiac transplantation in the united states: an analysis of the unos registry. clinical trans- plants, pages 35–43, 2008.
Cardiac transplantation in the united states: an analysis of the UNOs registry is a research paper by Matthew J. Everly.
What is the abstract?For people with advanced heart disease, cardiac transplantation is a crucial choice. The number of heart transplants carried out annually in the US is around 2,000. Due to a shortage of contributors, this figure has stayed fairly steady. Coronary artery disease and dilated cardiomyopathy were the two main causes of cardiac transplants prior to the last 20 years, however dilated cardiomyopathy has since replaced coronary artery disease as the leading factor.
With the introduction of more recent immunosuppressive drugs, survival rates have increased (tacrolimus and mycophenolate). For 43,906 heart transplants, the median survival time was around 9 years. The survival rate was still declining at 20 years, reaching only 10%. Seven-year survival rates were 59%, 62%, and 65%, respectively, for patients who received heart transplants between 1998 and 1994, 1995 and 2000, and 2000 and 2007.
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the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals speed up the heart’s rate while parasympathetic (rest and digest) signals slow it down. with which part or parts of the heart do you think sympathetic and parasympathetic neurons form synapses? explain your reasoning.
the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals speed up the heart’s rate while parasympathetic (rest and digest) signals slow it down. The part or parts of the heart that forms sympathetic and parasympathetic neurons form synapses is called cardiac plexus.
Cardiac plexus is a plexus of the nerves that are present at the base of the heart and is divided into superficial and deep part. The sympathetic and the parasympathetic nerves form synapses with heart in the form of cardiac plexus.
The sympathetic nerves are responsible for activating flight or fight mode while parasympathetic nerves are responsible for restoring the normal body state.
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How many moles of liquid iron will be produced from 1.08 moles of iron (III) oxide, Fe2O3?
donoghue pcj, purnell ma. genome duplication, extinction and vertebrate evolution. trends ecol evol. 2005;20:312–9.
Vertebrate evolution has been punctuated by way of three episodes of huge gene or genome duplication, which have been linked with the foundation of vertebrates, gnathostomes and teleosts, respectively. These three events coincide with bursts of character acquisition and increases in phenotypic complexity, and many researchers have recommended a causal relationship between the two. However, this pattern is derived from statistics for residing taxa only; we argue here that, when fossils are taken into account, bursts of character acquisition disappear and gen(om)e duplication in vertebrate phylogeny can no longer be correlated with the foundation of physique plans. If patterns of persona acquisition or morphological gaps between greater taxa are a reflection of phenotypic complexity, then extra inclusive statistics units incorporating fossil taxa provide no assist for hypotheses linking gen(om)e duplications and the evolution of complexity in vertebrates.
Vertebrates are animals that possess a vertebral column and/or notochord at any factor in their lives.” One of the methods existence is classified is thru the presence or absence of the vertebrate. Vertebrates and invertebrates developed from a common ancestor that was speculated to have lived around 600 million years ago.
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What is the independent variable?
Measurement
Comparison
What is being tested
The independent variable is what is being tested (option C).
What is an independent variable?Independent variable is the variable that is manipulated or changed in a series of an experiment.
On the other hand, a dependent variable is the variable that is being measured or recorded in the experiment.
For example, in an experiment where the effects of temperature is tested on the rate of change of a chemical reaction, the temperature is the independent variable because it is what is being tested.
Therefore, the independent variable of an experiment is what is being tested.
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5. Regular exercise helps remove buildup of plaque on artery walls by increasing blood flow
through arteries. Which of the following describes a long term effect of regular exercise on the
cardiovascular system?
A. Decreased blood pressure due to reduced resistance.
B.
High blood volume caused by the widening of the artery.
C. Increased blood pressure due to prolonged high blood flow.
D. Increased risk for diseases caused by reduced blood pressure.
According to the research, the correct option is A. Decreased blood pressure due to reduced resistance is a long term effect of regular exercise on the cardiovascular system.
What are regular exercises?Activities such as walking, jogging and swimming are some of the most common physical exercises, which are carried out frequently to preserve or optimize physical condition.
In this sense, it is recommended to strengthen the cardiovascular system with aerobic exercises that improves vascular responses by stimulating vasodilation and blood vessels increase their length and diameter thus lowering blood pressure.
Therefore, we can conclude that according to the research, the correct option is A. Decreased blood pressure due to reduced resistance is a long term effect of regular exercise on the cardiovascular system.
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How does the valve on the cooler compare with the switch in an electric circuit
The valve on the cooler compare with the switch in an electric circuit such that opening the valve allows water to flow, just like opening a switch allows charges to flow.
What is Valve?This refers to a substance which regulates the flow of a liquid by opening or closing it and is commonly used in pipes and other types of fittings. It also has some similarities in functions with that of a switch which is used in an electric circuit.
Opening the valve allows water to flow which is the same as how opening a switch allows charges to flow and vice versa which is the most appropriate comparison between the two substances.
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If all life has dna, and dna is made up of the same four nucleotides, how is it possible that each individual organism is so different?.
It is simply the order in which these smaller molecules are arranged that differs among individuals
Four nucleotides can be combined in how many different ways?The four nucleotides included in mRNA, A, U, G, and C, can form a total of 64 distinct combinations due to the codons' three-letter structure. Of these 64 codons, 61 correspond to amino acids and the final three to stop signals that signal the completion of protein synthesis.
Most genes are the same in all people , but a smaller number of genes are slightly different between people. Alleles are forms of the same genes with small difference in their sequence of DNA bases.
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Are we as individuals, a country or the world able to live sustainable ?
Answer:
Researchers broke down sustainable development into categories such as carbon dioxide emissions and use of natural resources like nitrogen, phosphorus and clean water. Bad news, Earthlings: It may be possible for everyone on the planet to live a “good” life.
Explanation:
Sustainability improves the quality of our lives, protects our ecosystem and preserves natural resources for future generations.
Sustainable living means understanding how our lifestyle choices impact the world around us and finding ways for everyone to live better and lighter. Applying a 'people lens' to sustainability is new, timely and opportunities are great.