Which of the following is NOT a requirement of natural selection?

A) differential reproductive success
B) overproduction of offspring
C) genetic variation
D) gene flow


D

Biology & Microbiology

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When a cell secretes a growth factor that binds to receptors on its own membrane preventing it from proliferating, this is an example of ____.

A. direct intercellular signaling B. endocrine signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling

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The genetic code is made up of units consisting

of how many nucleotides? a. 2 b. 3 c. 5 d. 6 e. 9

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Carbon dioxide generally enters a plant through pores called

A) mesophylls. B) stomata. C) cuticles. D) connexons. E) bacteriochlorophylls.

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Top-down factors that can control the population sizes of plants or animals include

A. seed-dispersing birds. B. parasites and predators. C. widespread phoresy. D. resource partitioning. E. Batesian mimicry.

Biology & Microbiology