Which substance usually passes in the greatest amount through the placenta from the blood of the fetus to the blood of the mother?
A. oxygen
B. carbon dioxide
C. amino acids
D. glucose
Answer: B. carbon dioxide
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Outside the CNS, groups of neuronal cell bodies that are clustered together to perform basic functions are termed
A. nerve nets. B. ganglia. C. nerves. D. spinal cords. E. soma.
The following is a list of events involved in the activation of a cell by a steroid hormone. Which one of the following answers best represents the order in which the steps occur?
1. cellular response to the hormone 2. activation of a gene 3. formation of a hormone-receptor complex 4. diffusion of the hormone through a target cell membrane 5. production of a protein A) 4, 3, 2, 5, 1 B) 2, 5, 4, 3, 1 C) 5, 3, 4, 1, 2 D) 2, 5, 1, 3, 4 E) 4, 3, 2, 1, 5
Experimental subjects are given a pill to test its effectiveness on reducing the duration of a cold. How should the control group be treated?
A) Do nothing with the control group. B) Give the control group two pills instead of one. C) Give the control group a pill that does not affect the duration of colds. D) Let the control group choose whether or not to take any pills.
Until Europeans began worldwide colonial activities about 500 years ago, humans had not introduced exotic species anywhere.
a. true b. false