In 1882, the tropical volcanic island Krakatoa

exploded and was reduced to an abiotic island
covered by a thick layer of volcanic ash. By 1933,
populations of all of the following organisms were
present. Which population was probably established
after the others?
a. ferns
b. bacteria
c. insects
d. rodents
e. mosses


Answer: d

Biology & Microbiology

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All of the following statements about a blastocyst are true EXCEPT

a. develops about 5 days after fertilization. b. still surrounded by the zona pellucida. c. comprised of blastomeres reorganized around the blastocyst cavity. d. still about the size of the original zygote. e. organized as embryoblast and trophoblast.

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In alcoholic fermentation, the final product is

a. pyruvate b. ethanol c. acetaldehyde d. acetyl CoA e. lactate

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These two species of velvet walking worms are an example of:

1.Allopatric speciation 2.Sympatric speciation 3.parapatric speciation 4.Hardy-Weinberg equilibrium

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Which of the following statements concerning enzymes is FALSE?

a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules

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