11. Organic molecules that increase the rate of metabolic reactions with themselves changing are known as

A. coenzymes
B. enzymes
C. substrates
D. reactants

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12. Protein portion of an enzyme when it is combined with organic molecule is termed as

A. apoenzyme
B. co-enzyme
C. holoenzyme
D. co-factors

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13. The active form of enzyme is

A. apoenzyme
B. coenzyme
C. holoenzyme
D. none of these

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14. Enzymes can

A. not pass through semipermeable membrane
B. pass through semipermeable membrane
C. dissolve semipermeable membrane
D. none of these

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