The rate of diffusion across a selectively
permeable membrane will be slow when which
of the following is (are) true?
I. concentration gradients are steep
II. temperatures are low
III. solutes are small molecules
a. I only
b. II only
c. I and III
d. II and III
e. I, II, and III
B
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A black guinea pig crossed with an albino guinea pig produced twelve black offspring. When the albino was crossed with a second black animal, six blacks and six albinos were obtained. What is the best explanation for this genetic situation?
A) Albino is recessive; black is dominant. B) Albino is dominant; black is incompletely dominant. C) Albino and black are codominant. D) Albino is recessive; black is codominant.
All phototrophic bacteria use a monophyletic photosystem in photosynthesis, thus there is intense competition for light between different phototrophic bacteria
Indicate whether the statement is true or false.
Which scientific name is written correctly?
A. S. aureus B. Staphylococcus aureus C. Staphylococcus aureus D. Staphylococcus Aureus E. staphylococcus aureus
Plant cells assimilate nitrogen in the form of:
a. ammonia and N2 b. N2 and nitrite c. nitrate and ammonia d. urea and nitrate e. N2 and urea