Biochemistry II: Enzymes - Dr. Ihab Abdel Moneam, PhD Lec. 1

Play an AI-generated podcast conversation about this lesson

What is the main function of enzymes?

To change their conformation in reactions

To decrease the specificity of reactions

To increase the equilibrium constant of reactions

To accelerate the rate of reactions by reducing the energy of activation (correct)

How are enzymes affected by entering reactions?

They lose their tertiary structure

They are unchanged (correct)

They become unreactive

They are denatured

Which type of enzymes act outside the cells?

Proenzymes

Intracellular enzymes

Extracellular enzymes (correct)

Metabolic enzymes

How do physical or chemical agents affect enzymes?

Cause denaturation resulting in loss of function Signup and view all the answers

What is the term for the specific tertiary structure of each enzyme?

Tertiary structure Signup and view all the answers

Which type of enzymes are sometimes secreted as proenzymes?

Extracellular enzymes Signup and view all the answers

What is the main reason zymogens are inactive?

Their active sites are masked by a polypeptide chain Signup and view all the answers

How are zymogens activated to become active enzymes?

By removal of the polypeptide chain to open the active site Signup and view all the answers

Which enzyme demonstrates group specificity in its action?

Pepsin Signup and view all the answers

What type of specificity does urease exhibit?

Absolute specificity Signup and view all the answers

Which enzyme example demonstrates optical specificity?

D-amino acid oxidase Signup and view all the answers

What is the key feature of the enzyme's active site?

It is where catalysis takes place Signup and view all the answers

What is the role of enzymes in a biochemical reaction?

Decrease the activation energy of the reaction Signup and view all the answers

How are enzymes named according to the text?

Based on the reactants they act upon Signup and view all the answers

What is the main function of an oxidoreductase enzyme?

Facilitate oxidation-reduction reactions Signup and view all the answers

What type of enzyme catalyzes the transfer of a group other than hydrogen?

Transferase Signup and view all the answers

In enzyme nomenclature, what can the name of an enzyme indicate?

The type of reaction the enzyme catalyzes Signup and view all the answers

What is the function of a hydrolase enzyme?

Catalyze hydrolysis reactions Signup and view all the answers