M5 L2 : Biochemistry Lecture

What is the role of enzymes in living organisms?

• Prevent chemical reactions

• Have no effect on chemical reactions

• Decrease the rate of chemical reactions

• Increase the rate of chemical reactions

How were enzymes named in the early days of biochemistry?

• At the whims of their discoverer

• Based on their function

• Following a systematic classification

• Using random letters

Which type of enzyme catalyzes the transportation of a functional group from one molecule to another?

• Transferases

• Oxido-reductases

• Lyases

• Hydrolases

What type of reaction do hydrolase enzymes catalyze?

• Oxidation

• Hydrolysis

• Reduction

• Transamination

Which enzyme catalyzes the hydrolysis of lactose?

• Transaminase

• Reductase

• Oxidase

• Hydrolase

What is the function of lyases enzymes?

• Catalyze hydrolysis reactions

• Catalyze breakdown of chemical bonds by means other than hydrolysis

• Catalyze transportation of functional groups

• Catalyze oxidation and reduction reactions

Which enzyme catalyzes the interconversion of ribulose-5-phosphate and xylulose-5-phosphate?

• Isomerase

• Ligase

• Transaminase

• Oxidase

What is the term used for the molecule that an enzyme acts upon?

• Inhibitor

• Product

• Catalyst

• Substrate

What is the lock and key model used to describe in enzyme-substrate interaction?

• Enzyme binds to multiple substrates

• Enzyme binds to any substrate

• Enzyme binds to a specific substrate

• Enzyme does not bind to any substrate

What is the main function of enzymes in the body?

• Break down fats

• Prevent chemical reactions

• Produce energy

• Increase the rate of chemical reactions