Which of the following organs or tissues can use glycerol and fatty acids as energy sources during the postabsorptive period?
A. heart
B. skeletal muscles like the bicep
C. brain
D. heart and skeletal muscles
E. skeletal muscles and brain
D. heart and skeletal muscles
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The active site of an enzyme ____
a. is where the coenzyme is located b. is a specific bulge or protuberance on an enzyme c. is a groove or crevice in the structure of the enzyme complementary to the substrate d. will react with only one substrate no matter how many molecules may resemble the shape of the substrate e. rigidly resists any alteration of its shape
Contraction of a skeletal muscle cell is initiated by the
A) release of acetylcholine by a neuron terminating at the neuromuscular junction. B) release of calcium ions by the neuron into the neuromuscular junction. C) electrical current traveling from the neuron directly into the muscle cell. D) hormones delivered by the blood supply to the nearby tissue. E) release of sodium ions by the neuron into the neuromuscular junction.
The NADPH required for the Calvin cycle comes from
A) reactions initiated in photosystem I. B) reactions initiated in photosystem II. C) the citric acid cycle. D) glycolysis. E) oxidative phosphorylation.
Which of these statements is not true of antibody molecules?
A) Cell-bound antibody molecules can bind cells that in turn release chemical compounds that damage parasitic worms. B) Antibody molecules can enhance phagocytosis of the antigen. C) Cell-bound antibody molecules can initiate a process that results in cell lysis. D) Cell-bound antibody molecules can bind complement, triggering the complement cascade. E) Antibody molecules can directly destroy antigen.