Which of the following statements about gastrin is false?
A. Gastrin secretion is initiated in response to
the sight or smell of food.
B. A low pH in the stomach inhibits the
secretion of gastrin.
C. Gastrin stimulates the production of HCl.
D. Gastrin is produced by the stomach,
absorbed within the small intestine, and
recirculated back to the stomach.
E. None of these statements about gastrin is
false.
A
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In the cell, energy released by electrons is often used to phosphorylate ________.
A. ATP B. NAD C. oxygen D. ADP E. pyruvic acid
The DNA sequence recognized by restriction endonucleases is generally how long?
a. 1?2 nucleotides b. 4?8 nucleotides c. 10?15 nucleotides d. 24?32 nucleotides e. 36?47 nucleotides
In which of the following ways are Chlamydia and viruses the same?
A. Both are best treated with antiviral chemotherapy. B. Both can remain dormant in the cell nucleus for long periods of time. C. Both are able to reproduce only within a eukaryotic cell. D. Both have surface proteins that cannot be recognized by the immune system.
Most of the active functions of plasma membranes are carried out by ____
a. cholesterol b. proteins c. hydrophilic heads d. hydrophobic tails e. carbohydrates