The most important molecules for making the cell membrane selectively permeable are ________
A) Phospholipids B) Proteins
C) Cholesterol D) ATP
A
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Through what opening does the spinal cord pass?
A. Vertebral foramen B. Vertebral arch C. Transverse foramen D. Intervertebral foramen E. Central canal
Rapid eye movement is descriptive of or occurs during
A. slow-wave sleep. B. both slow-wave sleep and paradoxical sleep. C. neither slow-wave sleep nor paradoxical sleep. D. paradoxical sleep.
The countercurrent multiplier is a system by which the
A. nephron loop multiplies the concentration of salts in the interstitial fluid of the kidney medulla. B. nephron loop dilutes the concentration of solutes in the tubular fluid at its hairpin turn. C. vasa recta secretes multiple amounts of metabolic wastes against their concentration gradient. D. vasa recta becomes more concentrated with nitrogenous wastes than the urine.
Arrange the following terms from the smallest to the largest: (1) cell, (2) organelle, (3) atom, (4) organ, (5) tissue.
A. 3, 1, 5, 4, 2 B. 1, 2, 3, 4, 5 C. 5, 4, 3, 2, 1 D. 3, 2, 1, 5, 4