A key is placed into a keyhole then turned and the door opens. When considering the components of cell signaling, the action of turning the key would best correspond to ______.
A. signal transduction that occurs when the receptor binds the hormone
B. the cell response that occurs when the receptor binds the hormone
C. the concentration of the hormone
D. conformational change in the receptor once bound to the hormone
E. the binding site of the receptor
D. conformational change in the receptor once bound to the hormone
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Which chemicals are natural pain suppressors?
a. substance P b. bradykinins c. prostaglandins d. histamine e. endorphins
Which of the following is not a characteristic of fungi?
a. membrane-bounded nuclei b. mitochondria c. cell wall of lipopolysaccharides d. primarily terrestrial in habitat e. reproduction via spores
Blood pressure drives the first step in urine formation, called _____________________.
A. tubular reabsorption B. antidiaresis C. tubular secretion D. glomerular filtration E. aldosterone processing
A tennis player serving the ball uses fast muscle fibers. The ATP needed to accomplish this comes from
A) anaerobic fermentation. B) aerobic respiration. C) conversion of lactic acid to ATP. D) conversion of Ca2+ to ATP.