There are how many different kinds of amino
acids in proteins?
a. 3
b. 6
c. 12
d. 20
e. 28
D
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The movement of substances to regions of lower concentration is called
A. active transport. B. diffusion. C. pinocytosis. D. pumping. E. exocytosis.
Which of the following is themuscle protein that binds and stores oxygen to maintain aerobic conditions in actively contracting muscle?
A. hemoglobin B. myoglobin C. troponin D. calmodulin
What features would enable a doctor to distinguish conclusively between the proliferative and secretory phases of the uterine cycle?
_____ the ratio of estradiol to progesterone _____ ratio of FSH to LH _____ thickened endometrium _____ presence of endometrial glands _____ loss of the endometrium
All of the following are correct about primary atypical pneumonia except
A. it can also be caused by adenoviruses. B. it is mainly caused by Mycoplasma pneumoniae. C. it has symptoms similar to pneumococcal pneumonia. D. it is transmitted by aerosol droplets. E. community resistance is high.