In diffusion, molecules move towards areas of
a. lower concentration
b. higher concentration
c. the same concentration
Ans: a. lower concentration
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Bacteriophages selectively infect bacterial cells. How might they be used as a therapeutic treatment in humans?
A. Bacteriophages can be used to genetically engineer bacterial cells making them more susceptible to drugs. B. Phages can be used to stimulate human immune cells to attack and kill bacterial cells. C. Phages can carry genes into cells which will genetically modify the host cells to prevent infection. D. Humans suffering from infections with antibiotic resistant bacteria can be treated with phages, which will infect and lyse the bacterial cells, leaving human cells unaffected.
The process of filtration in the glomerulus is driven by
a. active transport.
b. blood pressure.
c. osmosis.
d. dialysis.
e. sodium-potassium pumps.
Which of the following processes produces the most ATP per molecule of glucose oxidized?
A) All produce approximately the same amount of ATP per molecule of glucose. B) anaerobic respiration C) lactic acid fermentation D) aerobic respiration E) alcoholic fermentation
The tracheal system of insects __________.
cb. is stiffened with chitinous rings and leads into the lungs c. is filled by positive pressure breathing d. ramifies along capillaries of the circulatory system for gas exchange e. provides an extensive, fluid-filled system of tubes for gas exchange