Which of the following statements about enzymes is not true?
A. Enzymes are catalysts.
B. Almost all enzymes are proteins.
C. Enzymes operate most efficiently at optimum pH.
D. Enzymes are destroyed during chemical reactions.
Ans: D. Enzymes are destroyed during chemical reactions.
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In cell fractionation, which cellular structure or molecule is isolated in a pellet after the first centrifugation?
a. nuclei b. mitochondria c. ribosomes d. proteins e. nucleic acids
Which of the following is not true about pandas? a. There are only about 100,000 pandas left in the wild
b. They feed mainly on bamboo plants. c. They are an endemic species. d. They are an endangered species.
Certain molecules act like bank accounts for H+ ions because they can absorb excess H+ ions to keep a solution from becoming too acidic and release H+ ions to keep the solution from becoming too basic. Such molecules are called:
A) enzymes. B) buffers. C) reducing agents. D) isotopes. E) oxidizing agents.
Some bacterial cells are resistant to a variety of antimicrobials because they actively pump the drugs out of the cell.
Answer the following statement true (T) or false (F)