An individual who avoids light is exhibiting
(a) negative phototaxis.
(b) positive geotaxis.
(c) negative thigmotaxis.
(d) positive thigmotaxis.
(c) negative thigmotaxis.
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Which of the following does not affect the evolution of a group of organisms?
A. genetic drift B. mutation rates C. mating D. migration E. natural selection
Aerobic refers to what property of chemotrophs?
A) Chemotrophs remove carbon dioxide from the air. B) Chemotrophs require oxygen to produce energy. C) Chemotrophs use, but do not require oxygen. D) Fermentation releases great amounts of gas but only in chemotrophs. E) Heat losses occur in the presence of oxygen.
Which of the following protects bacteria from lysis in dilute solutions and helps to determine their cellular morphology or shape?
A. Capsule B. Peptidoglycan C. Gas vacuoles D. Plasma membrane
What characteristic does Vibrio share with Salmonella?
A. Both have O polysaccharide antigens. B. Both are oxidase positive. C. Both have polar flagella. D. Both have similar shape. E. Both are spread primarily by fecal contamination.