In the CAMP test the activity of a hemolysis produced by which organism is enhanced in a positive test?
A. Streptococcus pyogenes
B. Staphylococcus saprophyticus
C. Streptococcus pneumoniae
D. Staphyloccus aureus
Ans: D. Staphyloccus aureus
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Fluid entering the distal convoluted tubule:
A. is hyptertonic to the interstitial fluid. B. is hypotonic to the interstitial fluid. C. is isotonic to the interstitial fluid. D. may be hypotonic or isotonic to the interstitial fluid, depending on the length of the loop of Henle. E. may be hypertonic or isotonic to the interstitial fluid, depending on the length of the loop of Henle.
Approximately _____ percent of all fungi are yeasts
a. 1 b. 25 c. 50 d. 99
What is the usual pH of stomach acids?
a. 2 b. 7 c. 10 d. 12
Which of the following statements about extinction is TRUE?
A. Overexploitation by hunting and fishing is the biggest threat to tropical animals and plants. B. Introduction of new exotic species should help increase biodiversity, slowing species extinctions. C. Commercial hunting and fishing are always careful not to deplete animal reserves. D. Wild species often become extinct due to different combinations of factors. E. Without human activity, all species would survive and there would be no extinctions.