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.
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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.
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
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
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