Which of the following is not true of pyrimidine dimers?
A. They form between adjacent pyrimidines on the same DNA strand.
B. The reaction between the bases can form cyclobutane rings.
C. Pyrimidine dimers cause a significant distortion in the DNA.
D. Formation of the dimer also creates a break in the backbone that must be repaired before the next round of replication.
E. The reaction between the bases can form a 6-4 photoproduct.
D
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What is the sequence of events in a typical eukaryotic cell cycle?
A. G1 to G2 to S to mitosis to cytokinesis B. G1 to S to G2 to mitosis to cytokinesis C. G1 to S to G2 to cytokinesis to mitosis D. G1 to G2 to mitosis to S to cytokinesis E. S to G1 to G2 to mitosis to cytokinesis
In plants, haploid gametophytes produce gametes by
A. mitosis. B. nondisjunction. C. sporulation. D. meiosis. E. fertilization.
The product of the RB tumor-suppressor gene is found in the cytoplasm. Indicate whether the statement is true or false
If a new species is produced by the interbreeding of two members of distinct species, this would be ________ speciation achieved via ________.
A. allopatric; allopolyploidy B. sympatric; allopolyploidy C. sympatric; autopolyploidy D. allopatric; autopolyploidy E. sympatric; divergence