True or false: observations allow scientists to draw tentative explanations called hypotheses
A. true B. false
Answer: A
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Laser tweezers are used for
A) testing the purity of a culture. B) isolating individual cells. C) separating aerobes from anaerobes. D) enhancing the growth of fastidious organisms.
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.
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.
In a swamp, all of the alligators would represent a(n)
A. ecosystem. B. population. C. biosphere. D. organism. E. community.