Which of the following enzymes relieves the strain in DNA introduced by unwinding in E. coli?
A. gyrase
B. ligase
C. primase
D. helicase
E. SSB
A
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The nuclear lamina is an array of filaments on the inner side of the nuclear membrane. If a method were found that could cause the lamina to fall into disarray, what would you most likely expect to be the immediate consequence?
A) the loss of all nuclear function B) the inability of the nucleus to divide during cell division C) a change in the shape of the nucleus D) failure of chromosomes to carry genetic information E) inability of the ribosomes to produce proteins
The oldest proglottid of a tapeworm is
(a) the scolex. (b) the one nearest its neck. (c) the one in its middle. (d) the one at its end.
The Greek word oikos means
(a) environment. (b) habitat. (c) house. (d) community.
Which of the following is not a structural motif associated with transcriptional regulation?
A) combinatorial model B) helix-turn-helix C) zinc finger D) leucine zipper E) helix-loop-helix