The level of protein structure primarily involved in determining enzyme activity is the ________ enzyme.
A. primary
B. secondary
C. tertiary
D. quaternary
Answer: C
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Which of the following statements concerning human chorionic gonadotropin is incorrect?
a. it is secreted by the placenta. b. it maintains the corpus luteum of pregnancy. c. it is secreted by the corpus luteum of pregnancy. d. the presence of chorionic gonadotropin in the urine is the basis of pregnancy diagnosis tests. e. it is secreted primarily during the first ten weeks of gestation.
Select all that occur during the plateau phase of an action potential on a cardiac muscle cell.A) Calcium is entering the cell.B) Potassium is exiting the cell.C) Sodium is entering the cell.D) Calcium is exiting the cell.
What will be an ideal response?
Poly-X females are
A. never fertile. B. nonexistent. C. hermaphrodites. D. normally fertile.
What ion enters the muscle cell upon activation of the acetylcholine receptors?
A) sodium B) calcium C) potassium D) chloride