Mutations can create new alleles that

are beneficial to the organism's fitness.
have no effect on the fitness of the organism.
decrease the fitness of the organism.
All of the choices are correct.


All of the choices are correct.

Biology & Microbiology

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In DNA the purines are

a. thymine and cytosine. b. adenine and cytosine. c. adenine and guanine. d. thymine and adenine. e. guanine and thymine.

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Although nitrogen can act as a fertilizer initially, too much nitrogen added to a forest system can cause forest decline

Indicate whether the statement is true or false

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Fibers of the cytoskeleton are composed of primarily

A) proteins. B) nucleic acids. C) lipids. D) ER. E) polysaccharides.

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The earliest known mineralized structures in vertebrates are associated with _____

A) feeding B) locomotion C) defense D) respiration

Biology & Microbiology