The primary difference between individual nucleated cells in a developing zygote is the ____

a. genetic code of each cell
b. differential expression of housekeeping genes
c. differential expression of regulated genes
d. number of chromosomes present in the nucleus
e. presence or absence of gene regulators


ANSWER: c

Biology & Microbiology

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A. It did not involve deductive reasoning. B. It did not involve hypothesis-driven research. C. It involved hypothesis-driven research. D. It involved deductive reasoning.

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Eukaryotes are genetically closer to the archea

in the process of

a. metabolism. b. membrane formation. c. DNA replication. d. all of these. e. none of these

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Refer to the accompanying figure. The area of the tryptophan operon labeled as 3 is the:


a. promoter.
b. repressor gene.
c. ribosome.
d. RNA polymerase.
e. operator.

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Bacteria isolated from Lake Natron, where the water pH is close to 10, are which of the following?

A. alkaliphiles B. facultative anaerobes C. neutrophiles D. obligate anaerobes

Biology & Microbiology