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Enzymes and Catalysts in Biochemistry

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Questions and Answers

What is the main function of enzymes in biological systems?

To consume substrates

To increase the size of metabolites

To slow down chemical reactions

To act as catalysts (correct)

How do enzymes enable chemical reactions to occur at relatively high rates?

By functioning as biological catalysts made of proteins (correct)

By consuming metabolites

By decreasing the rate of the reaction

By changing their structure after the reaction

Why can many chemical reactions not occur spontaneously or happen very slowly in cells and organisms?

Due to normal temperatures and mild aqueous conditions

Due to the high concentration of enzymes

Due to the absence of metabolites

Due to the presence of specific enzymes (correct)

What happens if an enzyme that catalyzes a reaction is not present?

The reaction does not occur Signup and view all the answers

How do cells control chemical reactions involving enzymes?

By producing specific enzymes under certain conditions Signup and view all the answers

What is the main difference between anabolism and catabolism?

Anabolism involves building up larger molecules from smaller ones, while catabolism involves breaking down larger molecules into simpler ones. Signup and view all the answers

Which term describes the starting substance in an enzyme-catalyzed reaction?

Substrate Signup and view all the answers

What is the role of the active site in an enzyme molecule?

It stabilizes the transition state of the substrate. Signup and view all the answers

In what way are enzymes typically classified?

Based on the type of reaction they catalyze. Signup and view all the answers

What happens during a catabolic reaction?

Complex molecules are broken down into simpler ones. Signup and view all the answers