In the cell cycle, DNA is replicated during the G2 phase
__________________ Indicate whether the statement is true or false.
F, S
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The coronary vessels
a. supply and drain the heart muscle. b. bypass the heart ventricles. c. send blood directly to the lungs. d. are not really necessary because the heart can get its blood supply from the "inside." e. lead directly from the atria to the ventricles.
When food residues remain in the colon for too long, too much water is reabsorbed, and the feces
become dry and hard, a person is suffering from a. diarrhea. b. colitis. c. constipation. d. gastritis. e. enteritis.
A major event in the Precambrian era responsible for dramatically increasing organic material on Earth was:
A) deposition of carbon in rocks. B) leaching of sulfur into the oceans. C) evolution of photosynthesis. D) evolution of mitochondria.
Spindle fibers attach to the chromosomes and line up the chromosomes in the middle of the cell.Spindle fibers pull the sister __________ apart to form separate chromosomes which are moved toward opposite ends of the cell.
Fill in the blank(s) with the appropriate word(s).