All of the following are means of genetic recombination in prokaryotes EXCEPT
A. transformation.
B. transduction.
C. crossing over.
D. conjugation.
Answer: C
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An enzyme that cleaves internal phosphodiester bonds of a DNA molecule is a (n)
A. ligase. B. exonuclease. C. methylase. D. endonuclease.
In stabilizing selection
a. differential survival and reproduction favor the extremes of the population. b. humans are the chief factor controlling which organisms survive and reproduce. c. the intermediate type of organisms survive and reproduce. d. the characteristics of a population move in one direction or another through time. e. variability is encouraged in a population, and unusual forms are more common.
The thermoacidophile Sulfolobus acidocaldarius lacks peptidoglycan, but still possesses a cell wall. What is likely to be true of this species?
1. It is a bacterium. 2. It is an archaean. 3. The optimal pH of its enzymes will lie above pH 7. 4. The optimal pH of its enzymes will lie below pH 7. 5. It could inhabit certain hydrothermal springs. 6. It could inhabit alkaline hot springs. A) 1, 3, and 6 B) 2, 4, and 5 C) 1, 3, and 5 D) 1, 4, and 5
In fermentation, yeast produces
A. ethyl alcohol. B. oxygen. C. hydrogen. D. All of these answers are true.