Cytoplasmic signal transduction controls the checkpoints of the cell cycle.

a. true
b. false

Answer: a. true

Biology & Microbiology

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About 250 million years ago Earth’s continents merged into one supercontinent called ____

a. Nazca b. Eurasia c. Laurasia d. Gondwana e. Pangaea

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AIDS, or acquired immunodeficiency syndrome, is caused by ________.

A. a virus B. a protozoan C. a bacteria D. a fungus

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Chloroplasts most resemble _____

a. archaeans b. aerobic bacteria c. cyanobacteria d. early eukaryotes

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The formation of soil by gradually breaking rock into smaller particles by biological, chemical, and

physical processes is known as: a. erosion. b. inorganic synthesis. c. cation exchange. d. salinization. e. weathering.

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