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

Biology & Microbiology

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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.

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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.

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Which scientific name is written correctly?

A. S. aureus B. Staphylococcus aureus C. Staphylococcus aureus D. Staphylococcus Aureus E. staphylococcus aureus

Biology & Microbiology

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

Biology & Microbiology