Genetic screening can be used to identify all of the following except:a
PKU.
b. Tay-Sachs disease.
c. Huntington's disease.
d. sickle cell anemia.
e. serotonin deficiency
E
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Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
Quality control is set up on a new lot of an indole reagent. Clostridium bifermentans and Clostridium bolteae are used, and the following results are obtained: • C. bifermentans: positive • C. bolteae: negative Which one of the following statements explains this discrepancy?
a. The reagent is most likely expired. b. The incubation time is most likely abbre-viated. c. These two organisms are poor choices; both are indole-positive. d. No discrepancy is present. The results ob-tained are correct.
Which of the following statements best describes what happens when a bacterial cell is placed in a solution containing 5% NaCl?
A) Sucrose will move into the cell from a higher to a lower concentration. B) The cell will undergo osmotic lysis. C) Water will move out of the cell. D) Water will move into the cell. E) No change will result; the solution is isotonic.
A(n) __________ property is a characteristic of a
system that does not appear in any of its component parts. a. efferent b. emergent c. elective d. energetic e. living