When ATP breaks down into ADP and a phosphate group,
a. energy is absorbed by ADP and transferred to enzymes.
b. energy is released and can power cellular activities.
c. ADP becomes the active site in an enzyme.
d. the energy in the broken bond is transferred to the phosphate group.
Answer: b. energy is released and can power cellular activities.
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Aminoacyl-tRNA synthetases catalyze covalent addition of ________ to tRNAs.
Fill in the blank(s) with the appropriate word(s).
Who is largely responsible for proposing the endosymbiosis theory?
A. Schimper, Wallin, Margulis B. Lyon, Margulis, Schimper C. Schimper, Wallin, Barr D. Barr, Lyon, Margulis
The primary determinant of blood flow to a particular region of the body during normal physiological function is
A. the radius of arterioles. B. blood hematocrit. C. the length of arterioles. D. venous return regulated by sympathetic activation. E. leakage of fluids from the capillaries.
American bison consume only plants, so we would say they are ________
A) omnivores B) herbivores C) producers D) carnivores