Which category of signal exerts its effects on target cells by binding to membrane-bound receptor proteins?
A) neurohormones
B) estrogens
C) androgens
D) vitamin D
E) neurohormones, estrogens, androgens, and vitamin D
Answer: A) neurohormones
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It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.
Answer the following statement true (T) or false (F)
Examine Figure 41.1c. Which of the following best describes conditions at equilibrium?
A. No water molecules are moving across the barrier between the two compartments. B. A net movement of water molecules continues to add water to the right-hand compartment. C. A net movement of water molecules begins to add water to the left-hand compartment. D. Water molecules move randomly across the barrier with no net addition of water to either side. E. None of these choices accurately describe conditions at equilibrium.
One function of the 5' UTR (untranslated region) of mRNA is to
a. control the half-life of mRNA. b. extend the half-life of mRNA. c. decrease the half-life of mRNA. d. stabilize the mRNA structure. e. bind ribosomes for initiating translation.
In animals that have open circulatory systems, the interstitial fluid that functions as blood is called
A) lymph. B) plasma. C) hemolymph. D) hemocoel. E) leukocyte.