Mitotic divisions reduce the number of chromosomes found in daughter cells
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following is not true of translesion synthesis (TLS)?
A. TLS uses polymerases with wider-than-normal active site architecture to accommodate abnormal nucleotides in the template. B. TLS lacks the 3'-5' exonuclease activity usually required for proofreading. C. It is activated during replication when the polymerase stalls at a lesion; the TLS polymerase takes over long enough to extend the DNA over the lesion. D. TLS can be used to repair lesions such as pyrimidine dimers, bulky adducts, and double-stranded breaks. E. All of these choices are true.
A scientist obtains the DNA sequence datafor a bacterial plasmid. The data includes As, Ts, and Gs, but no Cs. What
is the most likely cause of this result?
a. ddCs were omitted from the sequencing reaction. b. The cytosine deoxyribonucleotides were omitted from the sequencing reaction. c. DNA polymerase was omitted from the sequencing reaction mix. d. The ddG fluorescent tags were degraded. e. There is no cytosine in this DNA molecule.
How does the lysogenic pathway differ from the lytic pathway? What will be an ideal response?
Choose the true statements about molecular clocks.
A. Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms. B. The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection. C. Molecular clocks can be calibrated using fossil evidence. D. All molecular clocks tick at the same rate.