Fossils currently exist for about how many species?

a. 1,000
b. 10,000
c. 100,000
d. 250,000
e. 500,000


ANSWER: d

Biology & Microbiology

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Wheat is a group of grass species that originated in the eastern Mediterranean and are now cultivated worldwide. In comparing wheat to other organisms, how would you evaluate the success of this species on the planet?

A. Examine the diversity of environments in which it is found. B. Examine the total biomass of wheat present on the planet. C. Examine the amount of variation of its genome. D. Examine its ability to grow outside of an agricultural setting. E. All of the answer choices are correct.

Biology & Microbiology

The DNA sequence recognized by restriction endonucleases is generally how long?

a. 1?2 nucleotides b. 4?8 nucleotides c. 10?15 nucleotides d. 24?32 nucleotides e. 36?47 nucleotides

Biology & Microbiology

The yield from each pyruvate in the second

stage of aerobic respiration includes a. 4 NADH. b. 1 FADH2. c. 1 ATP. d. 3 CO2. e. all of these.

Biology & Microbiology

Four of the five answers listed below are probable components of the Earth's primitive atmosphere

Select the exception. a. hydrogen gas b. oxygen gas c. nitrogen gas d. carbon monoxide gas e. carbon dioxide gas

Biology & Microbiology