How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~1
B. ~20
C. ~60
D. ~120
E. ~180
B. ~20
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Place the following events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract. A. 1,2,4,5,3,6 B. 4,2,1,5,6,3 C. 5,2,4,1,3,6 D. 1,6,4,2,5,3 E. 4,3,1,2,5,6
During the short recovery period before another
action potential, the a. threshold value is increased. b. threshold value is reduced. c. sodium gates are shut, and the potassium gates are opened. d. sodium-potassium pumps restore the ion gradients across the membrane. e. sodium gates are shut, potassium gates are opened, and the sodium-potassium pumps restore the ion gradients across the membrane.
Four of the five structures listed below belong to the
same sense. Select the exception. a. otolith b. vestibular apparatus c. semicircular canal d. cochlea e. saccule
3. You may expect to always see the same doctor if you choose _____
a private practice a hospital large health centers all of the above none of the above