Evolution acts at the level of the
A. species.
B. population.
C. ecosystem.
D. community.
Answer: B
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One hypothesis about the decline in cell numbers during death phase is that the cells aren't all dying but instead remain alive but unable to grow when cultured, at least temporarily. These are known as
A. death phase cells. B. ghost cells. C. programmed death cells. D. viable but nonculturable cells.
The simplest sensory receptors are __________ that respond to mechanical distortion, changes in temperature, or specific chemicals.
A. nociceptors B. free nerve endings C. gated channels D. photoreceptors E. ganglia
The type of ribonucleic acid that, together with proteins, makes up ribosomes; The most abundant type of RNA in most cells
What will be an ideal response?
Which of the following structural characteristics is not normally observed in a DNA duplex?
(a) purine–pyrimidine pairs (b) external sugar–phosphate backbone (c) uniform left-handed twist (d) antiparallel strands