The second messenger that causes calcium ion to be released from intracellular stores is
A. Diacylglycerol
B. Adenylyl cyclase
C. Inositol triphosphate
D. Phospholipase A
E. None of the choices are correct
Answer: C. Inositol triphosphate
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What event immediately precedes the nerve firing an action potential?
A. Depolarization is initiated. B. The threshold potential is reached. C. Volted-gated Na+ channels close. D. Volted-gated K+ channels open. E. The membrane becomes hyperpolarized.
Chemotherapeutic agents that are chemically modified natural products of microorganisms are most specifically referred to as ________.
A. antimicrobial agents B. semisynthetic drugs C. synthetic drugs D. antibiotics
The pulmonary circulation
a. involves the hepatic portal vein. b. moves oxygen-rich blood to the kidneys. c. includes the coronary arteries. d. leads to, through, and from the lungs. e. leads to, through, and from the heart.
You are hiking in a forest and happen upon a plant featuring a central stemlike structure from which sprout many, tiny, leaflike structures. Which of these would be the most certain means of distinguishing whether it was a true moss, or a club moss?
A) its color B) its height C) if seeds are present D) if conducting tissues are present E) the appearance of its spore-producing structures