A network of interactions that involves the cycling of materials and the flow of energy among organisms and their
physical environment is ____.
a. a population
b. a community
c. an ecosystem
d. the biosphere
e. the habitat
ANSWER: c
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Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. production of bicoid proteins in one end of the egg. B. maternal DNA molecules being deposited in one end of the egg. C. nurse cell migration to one end of the egg. D. maternal mRNA being deposited in one end of the egg. E. attachments of cadherins to one end of the cell.
Which of the following methods is not used to date fossils?
a. the amount of radioisotopes remaining b. index fossils c. the relative position in rock strata d. uranium-235 e. nitrogen-14
Prophylaxis is the use of antimicrobial drugs to
A) treat an infection. B) reduce infective dose. C) prevent infection. D) test susceptibility.
The main form(s) of nitrogen taken up by plant roots and useful to plants is/are
A. N-N. B. nitrite and nitrate. C. nitrate and ammonia. D. nitrite. E. ammonia and N-N.