Which of the following statements regarding enzyme function is false?
A) An enzyme's function depends on its three-dimensional shape.
B) Enzymes are very specific for certain substrates.
C) Enzymes are used up when they catalyze a chemical reaction so must be synthesized for each new chemical reaction.
D) Enzymes emerge unchanged from the reactions they catalyze.
Answer: C
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The hormone that controls the concentration of urine is:
a. insulin b. glucagon c. antidiuretic hormone d. thyroxine e. epinephrine
What percent of Earth is dry land?
a. 10 percent b. 25 percent c. 30 percent d. 45 percent e. 50 percent
The region of a gene encoding the 5'UTR (5' untranslated region) of an mRNA is not considered to be an exon.
a. true b. false
Fasciola hepatica is a
A. filarial worm. B. liver fluke. C. blood fluke. D. lung fluke. E. roundworm.