Which of the following maintains the corpus luteum and stimulates it to continue to produce the hormone progesterone?
A) human chorionic gonadotropin B) estrogen
C) testosterone D) progesterone
Answer: A
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An action potential is brought about by
a. a sudden membrane impermeability. b. the movement of negatively charged proteins through the neuronal membrane. c. the movement of lipoproteins to the outer membrane. d. a local change in membrane permeability caused by a greater-than-threshold stimulus. e. the movement of negatively charged amino acids through the neuronal membrane
The passive movement of a substance along its concentration gradient is termed:a
active transport. b. dialysis. c. diffusion. d. exocytosis. e. osmosis
Both pH and temperature affect cells by altering proteins' tertiary structure
a. true b. false
What components of membranes are the most abundant?
A. Carbohydrates B. Sterols C. Proteins D. Fats E. Phospholipids