The passive movement of a substance along its concentration gradient is termed:a
active transport.
b. dialysis.
c. diffusion.
d. exocytosis.
e. osmosis
C
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It has been suggested that RNA was the first informational molecule to evolve because:a
RNA molecules are more central to modern inheritance than DNA. b. RNA molecules can catalyze a variety of biologically important reactions. c. RNA molecules degrade more slowly in solution than DNA molecules. d. RNA molecules were the first molecules synthesized by Miller and Urey. e. RNA molecules have different structures..
Point mutations can occur in any given cell type, but they mostly affect only that one cell and cells produced by it. What cell type, if mutated, would allow the mutation to be passed on to family members for generations?
A) glial cells, such as those that produce a myelin sheath B) skin cells C) white blood cells D) gametes, such as an egg or sperm
Lucy, a new Army recruit, stood in formation for long periods of time without moving an inch. She eventually became lightheaded and fainted because her blood pressure dropped. What might have caused her blood pressure to drop?
What will be an ideal response?
Which of the following would be a function of the sympathetic division?
A) accelerate heart rate B) stimulate the stomach C) stimulate the gallbladder D) constrict the pupils