A gene mutation

a. is a change in the nucleotide sequence of DNA.
b. may be caused by environmental agents.
c. may arise spontaneously.
d. can occur in all organisms.
e. all of these


E

Biology & Microbiology

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The inhibitory affects of exposure to far-red light are permanent

A. true B. false

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An example of a negative estuary is:

a. Delaware Bay. b. Puget Sound. c. Laguna Madre. d. San Francisco Bay. e. Chesapeake Bay.

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What might be a reasonable function of restriction endonucleases in a bacterium, distinct from their use by molecular biologists?

What will be an ideal response?

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In order for allopatric speciation to occur, first there must be a geographic separation of two populations of the same species. The second step requires:

A) an increase in gene flow between the populations. B) additional extrinsic isolating mechanisms to become involved. C) physical and behavioral changes that keep them from interbreeding. D) physical and behavioral changes that permit occasional hybridization.

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