The rate of diffusion through a selectively
permeable membrane will be lowest 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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The primary determinant of blood flow to a particular region of the body during normal physiological function is
A. the radius of arterioles. B. blood hematocrit. C. the length of arterioles. D. venous return regulated by sympathetic activation. E. leakage of fluids from the capillaries.
Using phages to treat a bacterial infection is an interesting idea because
A. a single type of phage can destroy a wide range of strains of the same pathogen. B. of the increasing problem of antibiotic resistance. C. lysed bacteria pose no threat. D. a single phage can be genetically engineered to infect many different species of bacteria.
Complete reproductive isolation is evidence that what has occurred?
a. extinction b. speciation c. polyploidy d. hybridization e. gene flow
What organisms convert gaseous nitrogen into ammonium or nitrates that can be used by plants?
a. tertiary consumers b. nitrogen-fixing bacteria c. fish d. legumes e. corn and other grains