Motor neurons of the autonomic nervous system
A. always excite effector organs.
B. always inhibit effector organs.
C. do not excite effector organs but monitor their status of activity.
D. can either excite or inhibit effector organs.
Answer: D
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When the pH of body fluids begins to fall, proteins will
A) release a hydrogen from the amino group. B) bind a hydrogen at the amino group. C) release a hydrogen from the carboxyl group. D) bind a hydrogen at the carboxyl group. E) cause none of these actions.
The slimy mucus covering amphibian skin is designed to do all of the following EXCEPT:
A) prevent excessive water absorption B) conserve moisture C) aid in breathing D) serve as a defensive mechanism
How are sugars and starches classified?
A) nucleic acids B) lipids C) proteins D) carbohydrates
Oxygen is transported in the blood
A. bound to hemoglobin. B. bound to albumin. C. dissolved in the plasma. D. as part of the bicarbonate ion. E. dissolved in the plasma and bound to hemoglobin.