What are the sizes of two subunits used to compose prokaryotic ribosomes?
a) 20S + 50S
b) 30S + 40S
c) 30S + 50S
d) 40S + 60S
Ans: Ans: c) 30S + 50S
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Which of the following ecological locations has the greatest species diversity?
A) tundra B) deciduous forests C) tropical rain forest D) grasslands E) islands
Alex has just given blood at the Red Cross blood drive, and immediately after the event, his
blood pressure is a little lower than normal. How might his body respond to this?
a. Arteries can constrict to increase blood pressure. b. His body is able to immediately manufacture new blood cells. c. All the lost blood cells are replaced with water. d. Veins can dilate to reduce blood flow.
Gliese 581 is of interest to scientists because it is a ________
a. star of the same type as ours, which may have planets b. galaxy with a massive black hole in the center c. nebulae that is birthing new stars d. planet with an Earth-like mass orbiting a sun like ours
In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow b) disruptive selection c) directional selection d) genetic drift e) natural selection