Biology, Eighth Edition (Raven)

Chapter 14: DNA: The Genetic Material

Post Test

1
During the viral infection cycle of a bacterium, some of the DNA from the original virus particle is incorporated in progeny (new) virus particles. This information means that if you repeat the Hershey and Chase experiment, you can predict that (p. 258)
A)32P will be detected in the supernatant.
B)35S will be found in the supernatant.
C)Some progeny will have a little bit of radioactivity in them.
D)Every progeny phage will be radioactive.
E)Bacteria will mutate due to virus infection.
2
The reason the amount of A = T and G = C ("Chargaff's Rule") is because (p. 259)
A)purines base-pair with pyrimidines.
B)phosphates alternate with pentose sugars in the DNA backbone.
C)X-ray diffraction indicated a double-helical pattern in DNA.
D)DNA has polarity.
E)All of the above explain Chargaff's Rule.
3
Because polymerization of nucleotides is an endergonic process, energy is required for it to occur. DNA polymerase uses what as its energy source? (p. 264)
A)ATP.
B)Energy from photons of light.
C)Entropy created from protein digestion.
D)The nucleotides themselves.
E)A and B are both correct.
4
Formation of a replication fork results in (p. 266)
A)continuous synthesis of DNA on the lagging strand.
B)buildup of torsion in the parental DNA upstream of the fork.
C)formation of new 3' -OH regions on the template DNA.
D)binding of SSB protein on the double-stranded parental DNA.
E)All of the above occur when the replication fork is formed.
5
If the middle sequence of the template RNA coenzyme for telomerase is altered, which of the following is most likely to result? (p. 272)
A)Repeating regions in the chromosome telomeres will also have altered sequence.
B)Chromosomes will shorten with subsequent cell divisions.
C)The cell will die sooner than one in which the sequence has not been altered.
D)Premature aging of the organism will be detected.
E)All of the above will probably occur.
6
Excision-repair of damaged DNA does not require the action of which of these? (p. 274)
A)The uvr complex
B)DNA ligase
C)Helicase
D)DNA polymerase
E)Template DNA
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