Which molecule is secreted from the peritubular capillary network into the convoluted tubules?
A. salt
B. plasma proteins
C. H+
D. nutrients
E. water
Answer: C
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What is the function of inhibin?
a. To inhibit sperm production b. To concentrate testosterone in the testes c. To inhibit FSH secretion d. To stimulate FSH secretion e. To stimulate the interstitial cells to produce testosterone
You discover a new organism while on vacation in Yellowstone Park. You use a series of experiments to establish that it carries out aerobic respiration, but find that it has a unique ATP synthase that requires 16 protons per rotation. What does this tell you about the P/O ratio in this organism?
A. The new organism only makes ATP by substrate-level phosphorylation. B. The P/O ratio in the new organism is higher than your P/O ratio. C. The P/O ratio in the new organism is lower than your P/O ratio. D. The P/O ratio in the new organism is the same as your P/O ratio.
All macromolecules that are important in living systems contain:
A) nitrogen. B) potassium. C) aldehydes. D) carbon. E) polymers.
All of the following can positively influence the structure of tooth enamel except
A. antibodies in saliva. B. fluoride. C. genetics. D. lysozyme in saliva. E. refined sugar.