Enzymes are able to speed up the rate of a reaction by
A. binding substrates to a membrane.
B. producing more enzymes.
C. producing more substrates.
D. lowering the energy needed for the reaction to proceed.
E. transferring electrons from one substance to another.
Answer: D
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A. Paleozoic B. Cenozoic C. Precambrian D. Mesozoic
What is the primary determinant of how far an agent travels into the respiratory tract?
a. size of the agent b. immune status of the host c. amount of mucus d. depth of breathing e category of organism
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