Blood pressure drives filtration in the ____
a. urethra
b. renal artery
c. glomerulus
d. plasma
e. sodium-potassium pumps
ANSWER: c
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Excessive heat or extremes of pH often cause denaturation of proteins, which means that the proteins
a. have fallen apart into individual monomer subunits. b. are no longer biological molecules. c. have broken into many separate domains. d. are no longer in a functional three dimensional structure. e. are highly reactive.
Which of the following statements describes mycorrhizae?
A. A mycorrhiza is a mutualistic relationship between fungi and the roots of most plants. B. A mycorrhiza is a parasitic relationship between bacteria and the roots of most plants. C. A mycorrhiza is a mutualistic relationship between bacteria and the roots of most plants. D. None of these statements describes a mycorrhiza.
How can urine contain a higher concentration of wastes (be hypertonic) than the blood?
Select one: a. Urine cannot since the process is passive diffusion. b. Reabsorption of water in the loop of the nephron and collecting ducts leaves behind a more concentrated urine. c. All stages in the kidney involve active transport. d. Urine can be hypertonic for small molecules if it is hypotonic for an equal number of big molecules. e. The whole nephron is impermeable to water.
Which of the following groups of algae does NOT produce compounds that are toxic to humans?
A) diatoms B) dinoflagellates C) green algae D) red algae E) None of the answers is correct; all of these groups of algae produce compounds toxic to humans.