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

Biology & Microbiology

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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.

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Histamine, released during inflammation, is associated with which defense mechanism?

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A codon is composed of how many bases?  

A.  one B.  two C.  three D.  four E.  64

Biology & Microbiology