Complementary base-pairing allows for
A) spontaneous mutations to occur.
B) genes to be expressed as a phenotype.
C) DNA to serve as its own template for replication.
D) replication to be semiconservative.
E) covalent bonds to form between the opposite bases.
C
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Triglycerides are composed of ________ and ________
a. three fatty acids / one glycerol b. four fused hydrocarbon rings / hydroxyl groups c. three glycerols / one fatty acid d. a hydrophilic head / two hydrophobic tails
One primary spermatocyte produces ____________________ (how many?) functional sperm(s); one
primary oocyte produces ____________________ functional egg(s). What will be an ideal response?
As the human immunodeficiency virus (HIV) begins to kill the host's _____________________, the host's immune system begins to fail.
a. liver cells b. RNA c. red blood cells d. DNA e. white blood cells
In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a frog, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is
A. a modern amphibian. B. a transitional fossil between fish and amphibians. C. a ray-finned fish. D. a transitional fossil between amphibians and reptiles.