HIV infects cells by recognizing the cell-surface markers with its own
A. DNA.
B. glycoproteins.
C. reverse transcriptase.
D. capsid protein.
E. enzymes.
B. glycoproteins.
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Detergents are best able to dissolve oil from fabric or dishes during washing because
A) the positively charged end is associated with a sphere of hydration, while the negatively charged end interacts with the oil droplet. B) the negatively charged end is associated with a sphere of hydration, while the positively charged end interacts with the oil droplet. C) the nonpolar end is associated with a sphere of hydration, while the charged end interacts with the oil droplet. D) the charged end is associated with a sphere of hydration, while the nonpolar end interacts with the oil droplet. E) because detergents are nonpolar, they increase the size of the oil droplet, allowing the water to be more effective at removing the oil.
The ability to extend a leg originates from:
a. contraction of ligaments b. contraction of tendons c. contraction of a muscle d. lengthening of a muscle e. relaxation of a synovial joint
Valleys are usually ________ than nearby hilltops because ________
A) warmer; they receive more solar irradiance B) cooler; they usually hold a body of cool water C) cooler; cool air is heavier than warm air D) warmer; warm air is heavier than cool air
Lipid-soluble molecules would be expected to cross the cytoplasmic membrane by which of the following processes?
A) osmosis B) facilitated diffusion C) diffusion D) active transport E) group translocation