What is the largest sulfur reservoir on Earth?
a. the aquatic biosphere
b. the oceans
c. rocks and sediments
d. the terrestrial biosphere
Answer: C
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Which of the following statements regarding the Ras protein is false?
A) Ras is monomeric. B) It is regulated by GTPase activating proteins. C) The ligands are largely steroid hormones. D) It is regulated by Sos, a guanine nucleotide exchange factor. E) Ras activates a cascade of phosphorylation events.
An intracellular parasite primarily transmitted as an STD is the agent of ________, which may cause enough damage to result in blindness
A) primary amebic meningoencephalopathy B) trachoma C) rabies D) tetanus E) cryptococcal meningitis
In Belding's ground squirrels, it is mostly the females that behave altruistically by sounding alarm calls. What is the likely reason for this distinction?
A) Males have smaller vocal cords and are less likely to make sounds. B) Females invest more in foraging and food stores, so they are more defensive. C) Females settle in the area in which they were born, so the alarm is more likely to warn kin. D) The sex ratio is biased. E) Males forage in areas separate from females; therefore, alarm calls are useless.
In the calculation of Hardy-Weinberg equilibria in the context of nonrandom mating, random mating is represented by the factor f equal to 1
Indicate whether the statement is true or false