A technique used for preparing a slide with colorless bacteria against a colored background is called
a) negative staining.
b) Gram staining.
c) acid-fast staining.
d) endospore staining.
Answer: a) negative staining.
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Citrate synthase, the first enzyme in the citric acid cycle, is regulated by ATP concentrations. Why is early regulation
of ATP production the most beneficial method for the cell?
a. It is not possible to regulate the last enzyme in a pathway. b. More ATP can be produced before the first enzyme is inactivated. c. ATP production always needs to be maximized. d. Citrate synthase controls the amount of pyruvate produced by glycolysis. e. Regulating early steps conserves cellular fuels.
The region where completely formed urine collects is
indicated by a. A. b. B. c. D. d. E. e. both A and B.
In cats an X-linked pair of alleles, B and b, controls color of fur. The alleles are incompletely
dominant: B produces black, b produces yellow, and Bb produces tortoise-shell. (a) A yellow cat had a litter of two tortoiseshell kittens and one yellow. What is the sex of the yellow kitten? (b) A tortoiseshell cat brings home a litter of black, yellow, and tortoiseshell kittens. The color of which sex would tell you the color of the tomcat that produced them? (c) A yellow male is crossed with a tortoiseshell female. If the female has all male kittens in her litter of four, what color(s) would they be? (d) A tortoiseshell cat brings home her litter of black, yellow, and tortoiseshell kittens. By what method could you possibly decide whether the male parent was the black tomcat next door? What will be an ideal response?
In nature, organisms with characteristics that enhance survival are more likely to survive and reproduce than variants that lack desirable traits. This is known as
A. artificial selection. B. natural selection. C. mutagenesis. D. None of the above is correct.