In DNA, a purine must always pair with a pyrimidine and vice versa in order to ensure that
A. the distance between the two phosphodiester backbones remains constant.
B. the two strands are antiparallel.
C. the distance between one base pair and the next remains constant.
D. each base pair is held together by three hydrogen bonds.
A. the distance between the two phosphodiester backbones remains constant.
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In insects, primary symbionts are ________, while secondary symbionts ________
A) heritable / are transmitted horizontally B) able to replicate outside of the host / are obligate symbionts C) required for host reproduction / are not required for host reproduction D) obligate symbionts / have a free-living replicative stage
How many copies of each gene are present in these skin cells at G2 of interphase?
A. 2 B. 4 C. 6 D. 8
The substance that an enzyme combines with is
a. another enzyme. b. a product. c. an active site. d. the substrate.
Receptors for fast pain
A) generally arise from muscles or internal organs. B) give rise to a phenomenon called referred pain. C) transmit action potentials to the brain along the same neurons used by spinal neurons. D) generally occur in or near skin. E) initiate action potentials that travel more quickly.