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..
B
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The ratio of toxic dose to therapeutic dose is called the
A. therapeutic index. B. phenol coefficient. C. susceptibility quotient. D. toxicity index.
Saprobes are ________
a. fungi, animals, prokaryotes, or protists b. all of the choices c. chemoheterotrophs d. decomposers
Arteries
a. are under greater pressure than veins. b. are thinner than veins. c. carry blood toward the heart. d. have valves to prevent backflow.
Which of the following statements is TRUE
about NADPH? a. It is an enzyme. b. It is the oxidized form of NADP+. c. It is generated n the light-dependent reactions of photosynthesis. d. It accepts hydrogen and electrons from carbohydrates. e. It obtains energy from ATP.