A person develops anti-A antibodies only after he is exposed to antigen A, and anti-B antibodies only after he is exposed to antigen B.
Indicate whether the statement is true or false
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Question 2) The enterogastric reflex serves to ________.
A) relax the ileocecal valve when chyme is on its way to the colon
B) stimulate acid and enzyme secretion when food enters the stomach
C) inhibit gastric motility when there is chyme in the small intestine
D) relax the stomach in preparation for swallowed food
E) stimulate intestinal motility when there is food in the stomach
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Question 3) Which one of the following would not increase the rate of a reaction?
A) The presence of an enzyme
B) A rise in temperature
C) The presence of a catalyst
D) A decrease in reactant concentrations
E) An increase in reactant concentrations
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Question 4) During climacteric, what can cause hot flashes?
A) Vasodilation of facial arteries
B) Vasodilation of cranial arteries
C) Vasoconstriction of cranial arteries
D) Vasodilation of cutaneous arteries
E) Vasoconstriction of cutaneous arteries
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Question 5) Which of the following is not a distal branch of the spinal nerve?
A) Communicating rami
B) Posterior root
C) Anterior ramus
D) Meningeal branch
E) Posterior ramus
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Question 6) Each immunoglobulin (Ig) has ________ antigen-bonding site(s).
A) four B) two C) one D) three E) six
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Question 7) The most important components in the cytoplasm of RBCs are hemoglobin and carbonic anhydrase.
Indicate whether the statement is true or false
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Question 8) The ________ is absent from most epidermis.
A) stratum granulosum
B) stratum spinosum
C) stratum corneum
D) stratum basale
E) stratum lucidum
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Question 9) Which is the correct sequence of events in the humoral immune response?
A) Antigen recognition antigen presentation clonal selection differentiation attack
B) Antigen presentation antigen recognition clonal selection attack differentiation
C) Antigen recognition differentiation antigen presentation clonal selection attack
D) Antigen presentation antigen recognition clonal selection differentiation attack
E) Antigen recognition antigen presentation differentiation clonal selection attack
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Question 10) Several digestive enzymes are secreted as zymogens because ________.
A) gastric cells do not have the necessary enzymes for their synthesis
B) they start digesting intracellular proteins of the gastric cells more quickly
C) it saves one step in their synthesis
D) they can start digesting dietary proteins more quickly
E) they act only in the stomach lumen and do not digest intracellular proteins
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