In plants, production of NADPH
A. occurs in the absence of light.
B. requires the production of a proton gradient.
C. occurs during the Calvin cycle.
D. requires electrons originally found in water.
Answer: D
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The long, cylindrical, contractile portions of a muscle fiber, which are composed of even smaller myofilaments, are called ___________________
a. myofibrils
b. sarcolemmas
c. myofilaments
d. sarcomeres
The tertiary structure of proteins is typified by the:a
association of several polypeptide chains by weak bonds. b. order in which amino acids are joined in a peptide chain. c. bonding of two amino acids to form a dipeptide. d. folding of a peptide chain to form an alpha helix. e. three-dimensional shape of an individual polypeptide chain
Which of the following agents is capable of inducing conversion of a prophage to the lytic cycle?
A) UV light B) X rays C) presence of +ssRNA D) both UV light and X rays E) both UV light and the presence of +ssRNA
Which of the following is incorrect regarding facilitated diffusion?
a. It is a passive process. b. It allows the movement of molecules from areas of low concentration to areas of high concentration. c. It may use either channel or carrier proteins. d. It allows the rapid transport of glucose across the membrane.