What structures in the cell membrane are responsible for moving substances across the membrane?
a. Recognition proteins
b. Vacuoles
c. Cholesterol
d. Transport proteins
e. Phospholipids
d
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"Accomodation" is the process in the eye of
A. bending light rays to varying degrees by the lens. B. converting light energy into electrical signals by the retina. C. adjustment to varying light levels by altering the sensitivity of the eye. D. adjustment of the amount of light admitted to the eye by adjusting pupil diameter. E. regulation of vitreous humor volume.
In a muscle that is resistant to fatigue, such as that of a marathon runner, you would expect
A) a nonstriated appearance. B) elevated levels of ATP. C) very few mitochondria. D) a limited (or decreased) blood supply.
Why do slime molds represent a transitional life-form?
What will be an ideal response?
At the breakfast table, your roommate says, "Oops! I forgot to take my melatonin last night. I'd better take it now." How do you respond?
A. "Don't take it after a meal - it promotes the 'fight-or-flight' response, not 'rest-and-digest'." B. "Good idea - you don't want your bones to get brittle." C. "Don't take it now - it regulates biological rhythms, and is normally high at night and low during the day." D. "Be sure not to take too much, or your blood sugar could get dangerously low."