Accounting Text and Cases 11th Edition by Robert Anthony
DNA ReplicationFull description
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Practice Questions Chapter 16
1) One type of virus virus that infects infects bacteria bacteria is called called a(n) a(n) A) phage.
B) mage.
C) rhinovirus.
D) filovirus.
E) Ebola.
Answ Answer er:: A 2) DNA and and RNA RNA are polyme polymers rs of A) fatty acids. B) nucleotides. nucleotides. C) monoglycerides monoglycerides.. D) amino acids. E) monosaccharid monosaccharides. es. Answ Answer er:: B 3) Which of these these is always true with regard regard to a DNA double double helix? A) The amount of adenine is equal to the amount of uracil, and the amount of guanine is equal to the amount of cytosine. B) The amount of adenine is equal to the amount of thymine, and the amount of guanine is is equal to the amount of uracil. C) The amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount of cytosine. D) The amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount of thymine. E) The amount of adenine is equal to the amount of thymine, and the amount of guanine is is equal to the amount of cytosine. Answ Answer er:: E 4) What enzyme enzyme catalyzes catalyzes the elongation elongation of a new DNA strand? strand? A) helicase helicase B) primase primase C) ligase ligase D) single-stranded binding protein E) DNA polymerase polymerase Answ Answer er:: E 5) What enzyme enzyme catalyzes catalyzes the unwinding unwinding of a DNA double double helix? A) helicase helicase B) primase primase C) ligase ligase D) single-stranded binding protein E) DNA polymerase polymerase Answ Answer er:: A
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6) In his work with pneumonia-causing bacteria and mice, Griffith found that A) the protein coat from pathogenic cells was able to transform nonpathogenic cells. B) heat-killed pathogenic cells caused pneumonia. C) some chemical from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. D) the polysaccharide coat of bacteria caused pneumonia. E) bacteriophages injected DNA into bacteria. Answer: C 7) E. coli cells grown on 15 N medium are transferred to 14 N medium and allowed to grow for two generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment? A) one high-density and one low-density band B) one intermediate-density band C) one high-density and one intermediate-density band D) one low-density and one intermediate-density band E) one low-density band Answer: D 8) A biochemist isolates and purifies various molecules needed for DNA replication. When she adds some DNA, replication occurs, but the DNA molecules formed are defective. Each consists of a normal DNA strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture? A) DNA polymerase B) ligase C) nucleotides D) Okazaki fragments E) primers Answer: B 9) What is the basis for the difference in the synthesis of the leading and lagging strands of DNA molecules? A) The origins of replication occur only at the 5' end. B) Helicases and single-strand binding proteins work at the 5' end. C) DNA polymerase can join new nucleotides only to the 3' end of a growing strand. D) DNA ligase works only in the 3' ¬ 5' direction. E) Polymerase can only work on one strand at a time. Answer: C 10) In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules? A) A = G
B) A + G = C + T
C) A + T = G + T
Answer: B
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D) A = C
E) G = T
11) The primer that initiates synthesis of a new DNA strand is usually A) RNA. B) DNA. C) an Okazaki fragment. D) a structural protein. E) a thymine dimer. Answer: A 12) A eukaryotic cell lacking telomerase would A) be unable to take up DNA from the surrounding solution. B) be unable to identify and correct mismatched nucleotides in its daughter DNA strands. C) experience a gradual reduction of chromosome length with each replication cycle. D) have a greater potential to become cancerous. E) incorporate one extraneous nucleotide for each Okazaki fragment added. Answer: C 13) The elongation of the leading strand during DNA synthesis A) progresses away from the replication fork. B) occurs in the 3' ¬ 5' direction. C) produces Okazaki fragments. D) depends on the action of DNA polymerase. E) does not require a template strand. Answer: D 14) The spontaneous loss of amino groups from adenine results in hypoxanthine, an unnatural base, opposite thymine. What combination of molecules could the cell use to repair such damage? A) nuclease, DNA polymerase, DNA ligase B) telomerase, primase, DNA polymerase C) telomerase, helicase, single-strand binding protein D) DNA ligase, replication fork proteins, adenase E) nuclease, telomerase, primase Answer: A 15) Of the following, the most reasonable inference from the observation that defects in DNA repair enzymes contribute to some forms of cancer is that A) cancer is generally inherited. B) uncorrected changes in DNA can cause cancer. C) cancer cannot occur when DNA repair enzymes work properly. D) mutations generally lead to cancer. E) cancer is caused by environmental factors that damage DNA repair enzymes. Answer: B
