Enzymes in Macromolecules and Ribozymes Quiz

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What is the main function of enzymes in the body?

Catalyze chemical reactions (correct)

Increase activation energy

Decrease the rate of chemical reactions

Act as energy sources in the body

Which type of enzymes are made of ribonucleic acids?

Pepsin

Protein enzymes

Ribozymes (correct)

ACE inhibitors

What is the function of Penicillin in relation to enzymes?

Destroys the bacterium by inhibiting enzyme activity (correct)

Increases blood pressure

Promotes enzyme synthesis

Interferes with viral copying

Which statement about enzymes is true?

Ribozymes are a type of simple enzyme Signup and view all the answers

What is the function of HIV protease inhibitors?

Interfere with viral copying Signup and view all the answers

Which part of a conjugated enzyme consists of a non-protein part?

ACE inhibitors Signup and view all the answers

What is a prosthetic group in the context of enzymes?

A cofactor that is tightly or covalently bonded to a protein permanently Signup and view all the answers

Which of the following is an example of a prosthetic group?

Thiamine Pyrophosphate Signup and view all the answers

What is the main feature of a competitive inhibitor?

Has a shape and structure similar to the substrate Signup and view all the answers

How does a non-competitive inhibitor affect enzyme activity?

Alters the tertiary structure of the enzyme Signup and view all the answers

What type of enzyme action involves the simple addition of a cofactor to an apoenzyme?

Activation Signup and view all the answers

Which process makes an active enzyme less active or inactive?

Inhibition Signup and view all the answers

What is the main function of Oxidoreductases?

Transfer electrons from one molecule to another Signup and view all the answers

Which subclass is involved when oxygen acts as an acceptor of hydrogen or electrons?

Oxidases Signup and view all the answers

What is the main role of Transferase enzymes?

Catalyze the transfer of a functional group between two substrates Signup and view all the answers

Which enzyme adds hydroxyl groups (OH) to its substrates?

Hydroxylases Signup and view all the answers

What does a Kinase enzyme catalyze?

Catalyze the transfer of a phosphate group from ATP to a specified molecule Signup and view all the answers

What is the main function of Hydrolase enzymes?

Break single bonds by adding the elements of water Signup and view all the answers

What happens to the rate of reaction if the enzyme concentration is doubled?

It doubles Signup and view all the answers

At what substrate concentration does a saturation point occur?

High substrate concentration Signup and view all the answers

What effect does a temperature below body temperature have on enzyme activity?

It decreases activity Signup and view all the answers

How does a deviation from the optimum pH affect enzyme function?

It decreases activity Signup and view all the answers

What is the role of Zymogens in enzyme activity?

They are activated by cleavage Signup and view all the answers

What is an allosteric site in enzyme action?

The site of regulatory binding other than the active site Signup and view all the answers

What type of enzymes catalyze the removal of groups from substrates by mechanisms other than hydrolysis?

Lyase Signup and view all the answers

Which type of enzymes catalyze the interconversion of stereoisomers and structural isomers?

Isomerase Signup and view all the answers

Which group of organic compounds are required by many enzymes for catalytic activity?

Coenzymes Signup and view all the answers

What type of coenzymes are organic compounds that are loosely bound to an enzyme and dissociate in an altered form as part of the catalytic cycle?

Cosubstrate Signup and view all the answers

Which type of enzymes catalyze the joining of two molecules?

Synthase Signup and view all the answers

What do lyase enzymes catalyze?

Removal of two groups from adjacent atoms to create a double bond Signup and view all the answers