Which one of the following activities would least likely be found in a topoisomerase?
A. cutting a phosphodiester linkage
B. inducing or relaxing twists in double- stranded DNA
C. adding nucleotides to the end of a DNA strand
D. reforming phosphodiester linkages
E. Topoisomerases are equally likely to perform all of these functions.
Answer C
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A codon is composed of how many bases?
A. one B. two C. three D. four E. 64
The enzyme used by retroviruses to make a DNA copy of their RNA genome is called
A. RNA polymerase. B. reverse transcriptase. C. DNA polymerase. D. RNA replicase.
One day after a biology class four of your friends argue about the difference between phylogeny and systematics. Which friend is right?
A. Friend A states that systematics and phylogenies are really the same, one is more recent than the other, but basically they are the same. B. Friend B says that systematics is the same as cladistics and cladistics is reconstructing clades, which ultimately lead to the development of phylogenies. C. Friend D says that the way she remembers is that systematics is the reconstruction and study of phylogenies. D. Friend C argues that systematics is the actual collecting and cataloguing of specimens into museums that can be used later by scientists to construct clades and phylogenies.
Histamine, released during inflammation, is associated with which defense mechanism?
A. innate B. adaptive C. active D. complementary E. cell-mediated