Species richness is ____ when any one species enjoys a position of dominance
a. no different
b. more dense
c. reduced
d. increased
e. complex
c
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A microbe is discovered growing near a deep sea thermal vent. When researchers bring a sample up to the surface and try to grow it in a lab at room temperature in a normal incubator, they are unsuccessful. Why?
A. The pressure isn't the same at sea level as it is on the ocean floor. B. Oxygen concentrations are very different between the two environments-it's possible the microbe is a strict anaerobe and is poisoned by the air (oxygen) in the lab. C. Salt concentrations might be different in the media the researchers are attempting to use and the salt water the microbe is used to living in. This might be causing osmotic pressure differences that the microbe can't tolerate. D. The temperature is probably different-the thermal vent would be very hot, while these researchers are trying to grow this microbe at room temperature. The enzymes in the cells are probably outside of their normal operating range at room temperature, and therefore nonfunctional. E. All of the above.
The difference between the vital capacities of young,
healthy adult males and that of young, healthy adult females is about __________ liters. a. 5.7 b. 4.2 c. 3.7 d. 2.5 e. 1.5
What are true about polymerases?
A. Telomeres allow duplicated chromosomes to become separated into daughter cells during M phase. B. Telomeres are found in all living cells. C. Telomeres cap the ends of linear chromosomes and prevent them from being recognized by the cell as broken DNA in need of repair. D. Telomeres contain repeated nucleotide sequences that are required to replicate the ends of linear chromosomes. E. All of the above are true regarding telomere characteristics. F. Only statements B and D are true regarding telomere characteristics. G. Only statements C and D are true regarding telomere characteristics.
Which of the following is an organic compound?
A. C6H12O6 B. CO2 C. O2 D. NaCl E. H2O