Lactation is stimulated by the hormone LH.

a. true
b. false


Ans: b. false

Biology & Microbiology

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Which of the following is the primary source of energy for chemoautotrophs?

a. inorganic molecules b. living organisms c. previously living organisms d. sunlight

Biology & Microbiology

Photosystem I and photosystem II are, respectively, part of

A. the carbon reactions only. B. the carbon reaction and the light reactions. C. respiration. D. the light reactions and the carbon reactions. E. the light reactions only.

Biology & Microbiology

In which demographic transitional stage is

India?

a. birth and death rates equally high; growth rate low b. death rate dropping fast; birth rate declining but slowly c. birth rates declining and approaching the death rates d. birth rate falling below death rate; population size decreasing e. death rate greatly exceeds birth rate; population is close to extinction

Biology & Microbiology

It has been proposed that large brains evolved in Homo species because

A) large brains allowed better visual acuity, which was favored by natural selection. B) large-brained individuals were better able to outwit and escape predators. C) natural selection favored large-brained individuals because they were better in social interactions. D) genetic drift increased the frequency of large-brained alleles. E) evolution of a large brain was a consequence of evolution of overall larger body size.

Biology & Microbiology