Chemical barriers composed of phospholipid bilayers form within biological systems because
A. cells expend ATP to position the phospholipid tails close together.?B. hydrophobic exclusion results in the close positioning of the nonpolar tails.?C. van der Waals forces attract the polar heads to the water inside the cell.?D. the inability of the polar heads to dissolve in water causes the heads to adhere to one another.
B
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To which region of the stomach does the esophagus connect?
A) fundus B) cardia C) body D) antrum E) pyloric part
What does excess postexercise oxygen consumption represent?
A) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used B) the amount of oxygen equal to the oxygen already used C) the amount of oxygen taken into the body immediately after the exertion D) amount of oxygen needed for aerobic activity to accomplish the same amount of work
Which organelle determines the structural and functional characteristics of the cell by controlling RNA and protein synthesis?
A) endoplasmic reticulum B) nucleus C) Golgi apparatus D) ribosomes E) mitochondria
Turning the ankle so that the plantar surface faces laterally is
A. eversion. B. inversion. C. supination. D. retraction.