The homeostatic interaction between the endocrine system and which other system is demonstrated by
the hypothalamus regulating the release of sex hormones?
a. circulatory system
b. reproductive system
c. digestive system
d. muscular system
e. urinary system
B
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What type of bond contributes to a protein's secondary structure?
a. peptide bonds b. covalent bonds c. ionic bonds d. hydrogen bonds e. protein bonds
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
It is difficult to make an HIV vaccine because the ____
a. virus mutates rapidly b. cost is prohibitive c. virus uses DNA d. virus is a retrovirus e. components of the virus is found in high concentrations in the blood
Which of the following are important components of the long-distance transport process in plants?
I) the cohesion of water molecules II) a negative water potential III) the root parenchyma IV) the active transport of solutes V) bulk flow from source to sink A) II, III, IV, and V B) I, III, IV, and V C) I, II, IV, and V D) I, II, III, and V