A sharp cline may indicate

A) a sudden increase in the mutation rate.

B) a population bottleneck.

C) a geographical obstacle, such as a mountain.

D) nonrandom mating.


C) a geographical obstacle, such as a mountain.

Biology & Microbiology

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The semi-fluid matrix that surrounds organelles in a cell is called the:

A. stroma. B. nucleoplasm. C. ribosome. D. cytoplasm.

Biology & Microbiology

The functional group shown above is ____

a. a carbonyl group b. a hydroxyl group c. a phosphate group d. an amino group e. a carboxyl group

Biology & Microbiology

This microscope produces an image of a light cell against a dark background; internal structures are not visible.

A) Compound light microscope B) Phase-contrast microscope C) Darkfield microscope D) Fluorescence microscope E) Electron microscope

Biology & Microbiology

Adenosine—uridine-rich elements are ________

A) cis-acting elements where ribosomes bind to in order to initiate translation B) trans-acting elements that block mRNA splicing C) trans-acting elements that bind to mRNA to recruit ribosomes to mRNA for translation initiation D) trans-acting elements that bind to mRNA to either degrade or stabilize mRNA E) cis-acting elements that recruit RNA-binding proteins to mRNA to either degrade or stabilize the mRNAs

Biology & Microbiology