Most of the organisms that normally inhabit our skin help defend us against infection
a. True
b. False
Indicate whether the statement is true or false
True
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Measuring its costs and benefits in terms of energy spent and/or gained, mutualism
A. is a lose-lose interaction. B. results in gain for both individuals. C. results in a gain for one individual and a loss for the other. D. results in a gain for one individual and neither a gain nor a loss for the other. E. none of these
One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. Adequate amounts of pepsin are already manufactured by the pancreas. B. Only the pepsinogen version is able to stabilize fat-water emulsions. C. Pepsin is denatured and rendered inactive in solutions with low pH. D. If cells produced active pepsin, they would digest their own cellular proteins.
Which of the following organs do NOT supply
enzymes or other compounds that aid the digestive process in the small intestine?
a. pancreas b. liver c. gallbladder d. large intestine e. all of these organs supply enzymes or other compounds that aid in the digestive process in the small intestine
Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. presence of epinephrine receptors B. exposure to epinephrine released by neighboring cells C. activation of protein kinases D. types of proteins expressed E. rate of metabolism