The process of natural selection is based on the assumption that

a. environmental changes will cause change in body structure in individuals
b. most changes from generation to generation are the result of mutations.
c. part of the population of organisms always remain stable
d. different traits inherited by offspring have different survival value


Answer: d. different traits inherited by offspring have different survival value

Biology & Microbiology

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In the glomerulus, blood is filtered under pressure through a filtration barrier made up of (select all correct choices):

A. capillary endothelial cells. B. a basal lamina. C. a layer of podocytes. D. renal corpuscles. E. loops of Henle.

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When a planarium is cut in half, a head will regenerate from the wounded anterior end and a tail will regenerate from the wounded posterior end. This is an example of

A. conditional specification. B. autonomous specification. C. fate mapping. D. Spemann's organizer. E. transforming growth factor.

Biology & Microbiology

The function of cell walls in plants is for____ and ___.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following patterns of information flow is unique to retroviruses within a cell?

A) RNA ? protein B) protein ? DNA C) RNA ? DNA D) DNA ? RNA E) protein ? RNA

Biology & Microbiology