Distinguish between a circadian clock and circadian rhythm
What will be an ideal response?
ANSWER: A circadian rhythm describes physiological processes that have a 24-hour rhythm. This
rhythm is generated by a gene-based circadian clock. Differential expression of circadian
clock genes establishes and controls circadian rhythms.
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Generation time can be defined as the:
a. time required for a bacterial population to double. b. time required for a bacterial population to triple. c. time required for a bacterial population to quadruple. d. half-life of bacteria.
Kingella spp. can be distinguished from Neisseria spp. by its:
a. negative test for catalase. b. positive test for lactose fermentation. c. positive test for catalase. d. negative test for oxidase.
The Centers for Disease Control estimate that ________ of all hospital patients acquire some type of health-care-associated infection.
A. about 1 percent B. about 5 percent C. about 50 percent D. about 20 percent
Which extinct hominin first appeared about 1.9 million years ago and had a larger brain than Homo habilis, its immediate predecessor?
A) Homo ergaster B) Homo neanderthalensis C) Homo sapiens D) Australopithecus