The cellular branch of adaptive immunity
A) is organized by T cytotoxic cells and carried out by T helper cells.
B) does not involve a memory function.
C) is based on antibody production.
D) is organized by T helper cells and carried out by T cytotoxic cells.
E) is based on the activity of both T and B cells.
Answer: D
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The region of an enzyme that catalyzes reactions is called a(n)
This diagram shows the basic structure and function of an enzyme, acting to catalyze a cell's chemical reaction.
A. cofactor site.
B. binding pocket.
C. reaction site.
D. catalyst site.
E. active site.
Which description illustrates an amphipathic molecule?
a. A phospholipid with two polar ends b. A phospholipid with two hydrophobic ends c. A phospholipid with only one hydrophilic end
d. A phospholipid with only one hydrophobic end e. A phospholipid with both a hydrophobic end and a hydrophilic end
Coenzyme Q:
a. transfers electrons. b. oxidizes glucose. c. is the ultimate source of energy in the citric acid cycle. d. transfers phosphate to ATP. e. reduces glucose.
Two or more atoms joined together through the sharing of electrons are called a(n)
A. molecule. B. ion. C. isotope. D. atomic unit. E. compound.