Ch 13 / 14 bio test
Use the following information to answer the next few questions. The enzyme polynucleotide phosphorylase randomly assembles nucleotides into a polynucleotide polymer. You add polynucleotide phosphorylase to a solution of ATP, GTP, and UTP. How many artificial mRNA 3 nucleotide codons would be possible? 3 27 6 81 9
27
At a specific area of a chromosome, the following sequence of nucleotides is present where the chain opens to form a replication fork: 3' C C T A G G C T G C A A T C C 5' An RNA primer is formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence? 5' G C C T A G G 3' 5' A C G T T A G G 3' 3' G C C T A G G 5' 5' A C G U U A G G 3' 5' G C C U A G G 3'
5' A C G U U A G G 3'
An Okazaki fragment has which of the following arrangements? 3' RNA nucleotides, DNA nucleotides 5' DNA polymerase I, DNA polymerase III 5' DNA to 3' primase, polymerase, ligase 5' RNA nucleotides, DNA nucleotides 3'
5' RNA nucleotides, DNA nucleotides 3'
In an analysis of the nucleotide composition of DNA, which of the following will be found? A + C = G + T G + C = T + A A = C A = G and C = T
A + C = G + T
In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules? A = G A = C G = T A + G = C + T A + T = G + T
A + G = C + T
The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following? DNA was the first genetic material. A gene from an organism can theoretically be expressed by any other organism. The same codons in different organisms translate into the different amino acids. Different organisms have different numbers of different types of amino acids. All organisms have experienced convergent evolution.
A gene from an organism can theoretically be expressed by any other organism.
Why is it so important to be able to amplify DNA fragments when studying genes? Restriction enzymes cut DNA into fragments that are too small. DNA fragments are too small to use individually. A gene may represent only a millionth of the cell's DNA. A clone requires multiple copies of each gene per clone. It is important to have multiple copies of DNA in the case of laboratory error.
A gene may represent only a millionth of the cell's DNA.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? There is no radioactive isotope of nitrogen. Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive. Avery et al. have already concluded that this experiment showed inconclusive results. Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins. Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long.
Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
During splicing, which molecular component of the spliceosome catalyzes the excision reaction? DNA protein lipid RNA sugar
DNA protein lipid RNA sugar
Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base? Neither of the two daughter cells would be radioactive. All four bases of the DNA would be radioactive. DNA in both daughter cells would be radioactive. One of the daughter cells, but not the other, would have radioactive DNA. Radioactive thymine would pair with nonradioactive guanine.
DNA in both daughter cells would be radioactive.
A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture? Okazaki fragments DNA ligase nucleotides primase DNA polymerase
DNA ligase
Which enzyme catalyzes the elongation of a DNA strand in the 5' → 3' direction? primase helicase DNA polymerase III topoisomerase DNA ligase
DNA polymerase III
What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized? DNA polymerase can join new nucleotides only to the 3' end of a growing strand. DNA ligase works only in 3' to 5' direction. Helicases and single-strand binding proteins work at the 5' end. Polymerase can work on only one strand at a time. The origins of replication occur only at the 5' end.
DNA polymerase can join new nucleotides only to the 3' end of a growing strand.
A new DNA strand elongates only in the 5' to 3' direction because DNA polymerase begins adding nucleotides at the 5' end of the template. DNA polymerase can only add nucleotides to the free 3' end. replication must progress toward the replication fork. the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. Okazaki fragments prevent elongation in the 3' to 5' direction.
DNA polymerase can only add nucleotides to the free 3' end.
Which of the following provides some evidence that RNA probably evolved before DNA? RNA polymerase makes a single-stranded molecule. RNA polymerase uses DNA as a template. DNA polymerase uses primer, usually made of RNA. RNA polymerase does not require localized unwinding of the DNA. DNA polymerase has proofreading function.
DNA polymerase uses primer, usually made of RNA.
Which of the following sequences in double-stranded DNA is most likely to be recognized as a cutting site for a restriction enzyme?
GGCC CCGG
Which of the following statements describes chromatin? Heterochromatin is highly condensed, whereas euchromatin is less compact. Only euchromatin is visible under the light microscope. Heterochromatin is composed of DNA, whereas euchromatin is made of DNA and RNA. Both heterochromatin and euchromatin are found in the cytoplasm. Euchromatin is not transcribed, whereas heterochromatin is transcribed.
Heterochromatin is highly condensed, whereas euchromatin is less compact.
Which of the following statements is true of histones? Each nucleosome consists of two molecules of histone H1. The carboxyl end of each histone extends outward from the nucleosome and is called a "histone tail." Histones are found in mammals, but not in other animals or in plants or fungi. The mass of histone in chromatin is approximately nine times the mass of DNA. Histone H1 is not present in the nucleosome bead; instead, it draws the nucleosomes together.
Histone H1 is not present in the nucleosome bead; instead, it draws the nucleosomes together.
Why do histones bind tightly to DNA? Histones are highly hydrophobic, and DNA is hydrophilic. Histones are negatively charged, and DNA is positively charged. Histones are positively charged, and DNA is negatively charged. Both histones and DNA are strongly hydrophobic. Histones are covalently linked to the DNA.
Histones are positively charged, and DNA is negatively charged.
Use the list of choices below for the following question: I. helicase II. DNA polymerase III III. ligase IV. DNA polymerase I V. primase Which of the enzymes separates the DNA strands during replication? I II III IV V
I
Use the list of choices below for the following question: I. helicase II. DNA polymerase III III. ligase IV. DNA polymerase I V. primase Which of the enzymes covalently connects segments of DNA? I II III IV V
III
What is the most logical sequence of steps for splicing foreign DNA into a plasmid and inserting the plasmid into a bacterium? I. Transform bacteria with a recombinant DNA molecule. II. Cut the plasmid DNA using restriction enzymes. III. Extract plasmid DNA from bacterial cells. IV. Hydrogen-bond the plasmid DNA to nonplasmid DNA fragments. V. Use ligase to seal plasmid DNA to nonplasmid DNA. I, II, IV, III, V IV, V, I, II, III III, IV, V, I, II III, II, IV, V, I II, III, V, IV, I
III, II, IV, V, I
Use the list of choices below for the following question: I. helicase II. DNA polymerase III III. ligase IV. DNA polymerase I V. primase Which of the enzymes removes the RNA nucleotides from the primer and adds equivalent DNA nucleotides to the 3' end of Okazaki fragments? I II III IV V
IV
Which of the following statements describes the eukaryotic chromosome? It consists of a single linear molecule of double-stranded DNA plus proteins. The number of genes on each chromosome is different in different cell types of an organism. It is composed of DNA alone. Active transcription occurs on heterochromatin but not euchromatin. The nucleosome is its most basic functional subunit.
It consists of a single linear molecule of double-stranded DNA plus proteins.
Which of the following is NOT true of a codon? It extends from one end of a tRNA molecule. It may code for the same amino acid as another codon. It is the basic unit of the genetic code. It never codes for more than one amino acid. It consists of three nucleotides.
It extends from one end of a tRNA molecule.
What is the effect of a nonsense mutation in a gene? It changes an amino acid in the encoded protein. It prevents introns from being excised. It introduces a premature stop codon into the mRNA. It has no effect on the amino acid sequence of the encoded protein. It alters the reading frame of the mRNA.
It introduces a premature stop codon into the mRNA.
Which of the following best describes the significance of the TATA box in eukaryotic promoters? It is the recognition site for a specific transcription factor. Its significance has not yet been determined. It sets the reading frame of the mRNA. It prevents supercoiling of the DNA near the start site. It is the recognition site for ribosomal binding.
It is the recognition site for a specific transcription factor.
In his transformation experiments, what did Griffith observe? Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains. Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form. Mice infected with a pathogenic strain of bacteria can spread the infection to other mice. Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic. Mutant mice were resistant to bacterial infections.
Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
Use the following model of a eukaryotic transcript to answer the next few questions. 5' UTR E1 I1 E2 I2 E3 I3 E4 UTR 3' Suppose that an induced mutation removes most of the 5' end of the 5' UTR. What might result? Removal of the 5' UTR will result in the strand not binding to tRNAs. The 3' UTR will duplicate and one copy will replace the 5' end. Removal of the 5' UTR has no effect because the exons are still maintained. The first exon will not be read because I1 will now serve as the UTR. Removal of the 5' UTR also removes the 5' cap, and the mRNA will quickly degrade.
Removal of the 5' UTR also removes the 5' cap, and the mRNA will quickly degrade.
What is meant by the description "antiparallel" regarding the strands that make up DNA? The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. One strand contains only purines and the other contains only pyrimidines. The twisting nature of DNA creates nonparallel strands. Base pairings create unequal spacing between the two DNA strands. One strand is positively charged and the other is negatively charged.
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
An experimenter has altered the 3' end of the tRNA corresponding to the amino acid methionine in such a way as to remove the 3' AC. Which of the following hypotheses describes the most likely result? The nearby stem end will pair improperly. tRNA will not form a cloverleaf. The aminoacyl-tRNA synthetase will not be formed. The amino acid methionine will not become covalently bound. The anticodon will not bind with the mRNA codon.
The amino acid methionine will not become covalently bound
If a cell were unable to produce histone proteins, which of the following would be a likely effect? Amplification of other genes would compensate for the lack of histones. Spindle fibers would not form during prophase. Pseudogenes would be transcribed to compensate for the decreased protein in the cell. There would be an increase in the amount of "satellite" DNA produced during centrifugation. The cell's DNA couldn't be packed into its nucleus.
The cell's DNA couldn't be packed into its nucleus.
In comparing DNA replication with RNA transcription in the same cell, which of the following is true only of replication? It makes a new molecule from its 5' end to its 3' end. The entire template molecule is represented in the product. It uses RNA polymerase. The process occurs in the nucleus of a eukaryotic cell. The process is extremely fast once it is initiated.
The entire template molecule is represented in the product.
In an experimental situation, a student researcher inserts an mRNA molecule into a eukaryotic cell after he has removed its 5' cap and poly-A tail. Which of the following would you expect him to find? The molecule attaches to a ribosome and is translated, but more slowly. The molecule is digested by hydrolytic enzymes because it is no longer protected at the 5' end. The mRNA could not exit the nucleus to be translated. The cell recognizes the absence of the tail and polyadenylates the mRNA. The molecule is digested by restriction enzymes in the nucleus. Previous Answers
The molecule is digested by hydrolytic enzymes because it is no longer protected at the 5' end.
Use the following information to answer the next few questions. A group of six students has taken samples of their own cheek cells, purified the DNA, and used a restriction enzyme known to cut at zero, one, or two sites in a particular gene of interest. Analysis of the data obtained shows that two students each have two fragments, two students each have three fragments, and two students each have one only. What does this demonstrate? The two students who have two fragments have two restriction sites within this gene. Each of these students is heterozygous for this gene. The students with three fragments are said to have "fragile sites." Each pair of students has a different gene for this function. The two students who have two fragments have one restriction site in this region.
The two students who have two fragments have one restriction site in this region. P
When the genome of a particular species is said to include 20,000 protein-coding regions, what does this imply? There are also genes for RNAs other than mRNA. Any other regions are "junk" DNA. The species is highly evolved. Each gene codes for one protein. There are 20,000 genes.
There are also genes for RNAs other than mRNA
Which of the following is true of transcription in domain Archaea? There is only one kind of RNA polymerase. It produces RNA transcripts that are processed after they leave the nucleus. It terminates in a manner similar to that in bacteria. It involves promoters that are identical to those in domain Eukarya. It is regulated in the same way as in domain Bacteria.
There is only one kind of RNA polymerase.
Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells are impaired in what way? They do not recombine homologous chromosomes during meiosis. They cannot replicate DNA. They cannot undergo mitosis. They cannot repair thymine dimers. They cannot exchange DNA with other cells.
They cannot repair thymine dimers.
Use the list of choices below for the following question: I. helicase II. DNA polymerase III III. ligase IV. DNA polymerase I V. primase Which of the enzymes synthesizes short segments of RNA? I II III IV V
V
In the 1920s, Muller discovered that X-rays caused mutation in Drosophila. In a related series of experiments in the 1940s, Charlotte Auerbach discovered that chemicals-she used nitrogen mustards-have a similar effect. A new chemical food additive is developed by a cereal manufacturer. Why do we test for its ability to induce mutation? We worry that it might cause mutation in cereal grain plants. We want to be sure that it increases the rate of mutation sufficiently. We want to make sure that it does not emit radiation. We want to prevent any increase in mutation frequency. We worry about its ability to cause infection.
We want to prevent any increase in mutation frequency.
Of the following, which is the most current description of a gene? a DNA subunit that codes for a single complete protein a DNA-RNA sequence combination that results in an enzymatic product a discrete unit of hereditary information that consists of a sequence of amino acids a DNA sequence that is expressed to form a functional product: either RNA or polypeptide a unit of heredity that causes formation of a phenotypic characteristic
a DNA sequence that is expressed to form a functional product: either RNA or polypeptide
Which of the following mutations would be most likely to have a harmful effect on an organism? a nucleotide-pair substitution a deletion of three nucleotides near the middle of a gene a single nucleotide insertion downstream of, and close to, the start of the coding sequence a single nucleotide deletion near the end of the coding sequence a single nucleotide deletion in the middle of an intron
a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Which of the following nucleotide triplets best represents a codon? a triplet at the opposite end of tRNA from the attachment site of the amino acid a sequence in tRNA at the 3' end a triplet in the same reading frame as an upstream AUG a triplet that has no corresponding amino acid a triplet separated spatially from other triplets
a triplet in the same reading frame as an upstream AUG
Which of the following modifications is least likely to alter the rate at which a DNA fragment moves through a gel during electrophoresis? decreasing the length of the DNA fragment neutralizing the negative charges within the DNA fragment altering the nucleotide sequence of the DNA fragment without adding or removing nucleotides acetylating the cytosine bases within the DNA fragment increasing the length of the DNA fragment
altering the nucleotide sequence of the DNA fragment without adding or removing nucleotides
When the ribosome reaches a stop codon on the mRNA, no corresponding tRNA enters the A site. If the translation reaction were to be experimentally stopped at this point, which of the following would you be able to isolate? separated ribosomal subunits with a polypeptide attached to the tRNA a cell with fewer ribosomes an assembled ribosome with a polypeptide attached to the tRNA in the P site an assembled ribosome with a separated polypeptide separated ribosomal subunits, a polypeptide, and free tRNA
an assembled ribosome with a polypeptide attached to the tRNA in the P site
How do we describe transformation in bacteria? the infection of cells by a phage DNA molecule the type of semiconservative replication shown by DNA the creation of a strand of DNA from an RNA molecule the creation of a strand of RNA from a DNA molecule assimilation of external DNA into a cell
assimilation of external DNA into a cell
When the spliceosome binds to this transcript, where can it attach? to the 5' UTR to an adjacent intron and exon at certain sites along an intron to the exons to the 3' UTR
at certain sites along an intron
Alternative RNA splicing increases the rate of transcription. is due to the presence or absence of particular snRNPs. is a mechanism for increasing the rate of transcription. can allow the production of similar proteins from different RNAs. can allow the production of proteins of different sizes and functions from a single mRNA.
can allow the production of proteins of different sizes and functions from a single mRNA.
The anticodon of a particular tRNA molecule is __________. complementary to the corresponding mRNA codon the part of tRNA that bonds to a specific amino acid catalytic, making the tRNA a ribozyme complementary to the corresponding triplet in rRNA changeable, depending on the amino acid that attaches to the tRNA
complementary to the corresponding mRNA codon
Assume that you are trying to insert a gene into a plasmid. Someone gives you a preparation of genomic DNA that has been cut with restriction enzyme X. The gene you wish to insert has sites on both ends for cutting by restriction enzyme Y. You have a plasmid with a single site for Y, but not for X. Your strategy should be to insert the fragments cut with restriction enzyme X directly into the plasmid without cutting the plasmid. cut the plasmid twice with restriction enzyme Y and ligate the two fragments onto the ends of the DNA fragments cut with restriction enzyme X. cut the plasmid with restriction enzyme X and then insert the gene into the plasmid. cut the DNA again with restriction enzyme Y and insert these fragments into the plasmid cut with the same enzyme. cut the plasmid with restriction enzyme X and insert the fragments cut with restriction enzyme Y into the plasmid.
cut the DNA again with restriction enzyme Y and insert these fragments into the plasmid cut with the same enzyme.
Which of the following sets of materials is required by both eukaryotes and prokaryotes for replication? topoisomerases, telomerases, polymerases nucleosome loosening, four dNTPs, four rNTPs ligase, primers, nucleases G-C rich regions, polymerases, chromosome nicks double-stranded DNA, four kinds of dNTPs, primers, origins of replication
double-stranded DNA, four kinds of dNTPs, primers, origins of replication
You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent Okazaki fragments and RNA primers. RNA primers and mitochondrial DNA. lagging strands and Okazaki fragments. leading strands and Okazaki fragments. leading strands and RNA primers.
eading strands and Okazaki fragments.
Garrod hypothesized that "inborn errors of metabolism" such as alkaptonuria occur because many metabolic enzymes use DNA as a cofactor, and affected individuals have mutations that prevent their enzymes from interacting efficiently with DNA. genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes. metabolic enzymes require vitamin cofactors, and affected individuals have significant nutritional deficiencies. enzymes are made of DNA, and affected individuals lack DNA polymerase. certain metabolic reactions are carried out by ribozymes, and affected individuals lack key splicing factors.
genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes.
In a nucleosome, the DNA is wrapped around __________. a thymine dimer polymerase molecules ribosomes satellite DNA histones
histones
Use the following information to answer the next few questions. A eukaryotic gene has "sticky ends" produced by the restriction endonuclease EcoRI. The gene is added to a mixture containing EcoRI and a bacterial plasmid that carries two genes conferring resistance to ampicillin and tetracycline. The plasmid has one recognition site for EcoRI located in the tetracycline resistance gene. This mixture is incubated for several hours, exposed to DNA ligase, and then added to bacteria growing in nutrient broth. The bacteria are allowed to grow overnight and are streaked on a plate using a technique that produces isolated colonies that are clones of the original. Samples of these colonies are then grown in four different media: nutrient broth plus ampicillin, nutrient broth plus tetracycline, nutrient broth plus ampicillin and tetracycline, and nutrient broth without antibiotics. Bacteria containing a plasmid into which the eukaryotic gene has integrated would grow in the nutrient broth, the ampicillin broth, and the tetracycline broth. in the nutrient broth and the tetracycline broth only. in all four types of broth. in the ampicillin broth and the nutrient broth. in the nutrient broth only.
in the ampicillin broth and the nutrient broth.
Use the following model of a eukaryotic transcript to answer the next few questions. 5' UTR E1 I1 E2 I2 E3 I3 E4 UTR 3' Suppose that exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1 (I1). What might occur? exclusion of E2 premature stop to the mRNA loss of the gene product loss of E1 inclusion of I1 in the mRNA
inclusion of I1 in the mRNA
E. coli cells grown on medium are transferred to medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment? one low-density and one intermediate-density band one low-density band one high-density and one intermediate-density band one intermediate-density band one high-density and one low-density band
one low-density and one intermediate-density band
Which of the following experimental procedures is most likely to hasten mRNA degradation in a eukaryotic cell? methylation of histones enzymatic lengthening of the poly-A tail removal of the 5' cap methylation of C nucleotides removal of one or more exons
removal of the 5' cap
Transcription in eukaryotes requires which of the following in addition to RNA polymerase? the protein product of the promoter aminoacyl-tRNA synthetase ribosomes and tRNA start and stop codons several transcription factors
several transcription factors
In a linear eukaryotic chromatin sample, which of the following strands is looped into domains by scaffolding? DNA without attached histones DNA with H1 only the 10-nm chromatin fiber the 30-nm chromatin fiber the metaphase chromosome
the 30-nm chromatin fiber
Which of the following can be determined directly from X-ray diffraction photographs of crystallized DNA? the rate of replication the diameter of the helix the frequency of A vs. T nucleotides the sequence of nucleotides the bond angles of the subunits
the diameter of the helix
The leading and the lagging strands differ in that the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction. the leading strand is synthesized at twice the rate of the lagging strand. the lagging strand is synthesized continuously, whereas the leading strand is synthesized in short fragments that are ultimately stitched together. the leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5' end.
the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction
Use the following information to answer the next few questions. A eukaryotic gene has "sticky ends" produced by the restriction endonuclease EcoRI. The gene is added to a mixture containing EcoRI and a bacterial plasmid that carries two genes conferring resistance to ampicillin and tetracycline. The plasmid has one recognition site for EcoRI located in the tetracycline resistance gene. This mixture is incubated for several hours, exposed to DNA ligase, and then added to bacteria growing in nutrient broth. The bacteria are allowed to grow overnight and are streaked on a plate using a technique that produces isolated colonies that are clones of the original. Samples of these colonies are then grown in four different media: nutrient broth plus ampicillin, nutrient broth plus tetracycline, nutrient broth plus ampicillin and tetracycline, and nutrient broth without antibiotics. Bacteria that do not take up any plasmids would grow on which media? the nutrient broth and the ampicillin broth the nutrient broth and the tetracycline broth the nutrient broth only all three broths the tetracycline broth and the ampicillin broth
the nutrient broth only
Which of the following is the first event to take place in translation in eukaryotes? the small subunit of the ribosome recognizes and attaches to the 5' cap of mRNA base pairing of activated methionine-tRNA to AUG of the messenger RNA elongation of the polypeptide binding of the larger ribosomal subunit to smaller ribosomal subunits covalent bonding between the first two amino acids
the small subunit of the ribosome recognizes and attaches to the 5' cap of mRNA
Use the following information to answer the next few questions. A group of six students has taken samples of their own cheek cells, purified the DNA, and used a restriction enzyme known to cut at zero, one, or two sites in a particular gene of interest. Why might they be conducting such an experiment? to find which of the students has which alleles to collect population data that can be used to assess natural selection to find the location of this gene in the human genome to collect population data that can be used to study genetic drift to prepare to isolate the chromosome on which the gene of interest is found
to find which of the students has which alleles