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
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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
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.
A holoenzyme is a combination of a protein and one or more substances called
What will be an ideal response?
Gram-negative nitrogen-fixing bacteria found in association with plant roots are
A. alphaproteobacteria. B. betaproteobacteria. C. cyanobacteria. D. gammaproteobacteria. E. deeply branching bacteria.