Which of the following is an example of positive interference?
A) An actively transcribed gene is less likely to undergo crossover than a quiescent one.
B) A single crossover stimulates further recombination.
C) Crossovers will not occur near centromeres.
D) A crossover in one region inhibits crossovers in nearby regions.
E) Double crossovers do not occur.
Answer: D
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A large number of cases of a particular disease observed in a relatively short period of time in an area that previously experienced only sporadic cases of the disease is known as a(n)
A) pandemic. B) outbreak. C) endemic. D) zoonosis.
Black widows spend their entire lives in their cobwebs, sitting and awaiting predators. When a
prey item stumbles into their web, they rush out quickly to subdue it but tend to fatigue quickly and cannot maintain high levels of activity for long periods. As a result, ____________________.
a. they have mostly fast-twitch muscles b. their muscles have high levels of myoglobin c. they need a constant supply of oxygen for fast contractions d. actin and myosin function without calcium
Which of the following hominin species was the first to leave Africa, it's fossils date from 1.9 to 0.2 mya, and it had a similar anatomy to our species?
A. Home floresiensis B. Home erectus C. Sahelanthropus tchadensis D. Australopithecus afarensis
An axenic environment is one
A) in which microorganisms remain with the person throughout life. B) that is free of microbes. C) that is a source of contamination. D) in which microorganisms remain present only for a short time. E) contaminated by microbial toxins.