According to the endosymbiotic theory, eukaryotic
cells evolved after and as a consequence of
a. the cyclic pathway of photosynthesis.
b. anaerobic respiration.
c. cell division.
d. the noncyclic pathway of photosynthesis.
e. chemosynthesis.
Answer: d
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The membranes of psychrophilic bacteria have relatively high levels of ________ fatty acids, which allow them to remain semifluid at cold temperatures.
A. unsaturated B. aromatic C. sterol D. saturated
Which of the following statements about magnetotaxis in the anaerobic bacteria Aquaspirilium is not correct?
A. Aquaspirilium swim using a flagellum toward magnetic north. B. Aquaspirilium can be attracted to the side of a dish using a bar magnet. C. Aquaspirilium contain bits of magnetized iron oxide used in sensing the earth's magnetic field. D. The earth's magnetic field is on a decline that guides Aquaspirilium deeper into the sediment. E. Anaerobic bacteria from New Zealand that swim toward magnetic south immediately reverse their attraction to magnetic north when moved to a northern environment.
Which of the following statements is not correct?
a. Water heats up and cools down very quickly. b. The amount of heat required to raise the temperature of 1 g of water 1 ?C is one calorie. c. Due to hydrogen bonds, water has a high surface tension. d. Large bodies of water have relatively constant temperatures. e. When one gram of water evaporates, it removes heat.
The male sage grouse who is "displaying" is likely _____.
A. indicating that he is ready to spar with other males B. claiming part of the territory as his own C. attracting a mate in a monogamous union D. attracting mates in a polygamous union E. indicating that he has won a mate