A racehorse cannot stand on one leg, but when it runs it rarely has more than one leg on the ground. Why is a running horse more stable than a standing one?
A) Its legs tilt so the hooves fall in line with its center of gravity.
B) Its momentum gives it stability.
C) It uses its neck for balance the way a tightrope walker uses a pole.
Answer: B
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Which one is not an amino acid?
a. Proline b. Glycine c. Alanine d. Valine e. Guanine
The human heart
a. contracts as a result of stimuli from the sinoatrial node. b. contracts only as a result of nerve stimulation from the central nervous system. c. is activated primarily through the autonomic nervous system. d. rate is primarily under the control of the atrioventricular node. e. is independent of all nervous control.
When aldosterone is secreted into the blood, blood pressure will ____________ .
Fill in the blank(s) with the appropriate word.
Which of the following is true for the signaling system in an animal cell that lacks the ability to produce GTP?
A) It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. B) It could activate only the epinephrine system. C) It would be able to carry out reception and transduction but would not be able to respond to a signal. D) It would use ATP instead of GTP to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. E) It would employ a transduction pathway directly from an external messenger.