True or false: observations allow scientists to draw tentative explanations called hypotheses

A. true B. false


Answer: A

Biology & Microbiology

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Laser tweezers are used for

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The lactose repressor

A. is transcribed with the structural lac genes. B. is inactivated by binding lactose. C. requires lactose for its transcription. D. is activated by binding lactose.

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Which of the following statements is NOT true?

a. Natural selection is based upon differential reproduction and survival. b. For evolution to occur in a population, there must be some variation. c. Most mutations have beneficial effects on traits. d. A population evolves when heritable change occurs in a line of descent. e. Over time, some genetic traits are more adaptive than others.

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In a swamp, all of the alligators would represent a(n)

A. ecosystem. B. population. C. biosphere. D. organism. E. community.

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