The sodium-potassium (Na+-K+) pump transports both sodium and potassium ________ their concentration gradients in a process called ________
A) down; countertransport
B) up; active transport
C) up; cotransport
D) down; active transport
E) up; facilitated transport
B
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A renal clearance test determines the rate at which the kidneys can
A. add a substance to the blood. B. excrete water. C. remove a particular substance from the blood. D. reabsorb ions.
Which of the following statements regarding NK cells is a false or incorrect statement?
A) NK cells are a type of neutrophil. B) NK cells are present in the blood, spleen, lymph nodes, and red bone marrow. C) NK cells attack cells that display abnormal MHC antigens. D) NK cells attack cancer cells and virus-infected body cells.
true or false? DNA replication results in two identical daughter molecules each consisting of one old (original) strand and one newly-synthesized strand.
a. true b. false
Which of the following correctly represents the mechanism of enzyme function?
S + P -> E-P -> E + P E + P -> E-P -> E-S -> E + S E + P -> E-S -> E-P -> E + P E + S -> E-S -> E-P -> E + P E + S -> E-P -> E-S -> E + S