If the apple and haw flies become distinct enough to be separate species, their evolution is an example of:

A) behavioral isolation. B) allopatric speciation.
C) sympatric speciation. D) gametic isolation.


Answer: C

Biology & Microbiology

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Action potentials move along axons _____

A) more slowly in axons of large than in small diameter B) by activating the sodium-potassium "pump" at each point along the axonal membrane C) more rapidly in myelinated than in non-myelinated axons D) by reversing the concentration gradients for sodium and potassium ions

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Antimicrobials that block protein synthesis by binding to the mRNA are

A) aminoglycosides. B) antisense nucleic acids. C) macrolides. D) beta-lactams. E) nucleic acid analogs.

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A holoenzyme is a combination of a protein and one or more substances called

What will be an ideal response?

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Gram-negative nitrogen-fixing bacteria found in association with plant roots are

A. alphaproteobacteria. B. betaproteobacteria. C. cyanobacteria. D. gammaproteobacteria. E. deeply branching bacteria.

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