Lesson 1

Question 1

What is an enzyme?

Answer 1

Globular proteins which have a specific tertiary structure

Question 2

Describe difference between an anabolic and catabolic reaction

Answer 2

Anabolic reactions build up whereas catabolic reactions break down

Question 3

Describe the lock and key model

Answer 3

• Substrate fits into enzyme because it is complementary to shape of enzyme
• Product released as it is no longer complementary
• Explains why enzymes are specific to substatte

Question 4

What is the induced fit model?

Answer 4

• Substrate and active sit not complementary
• Active site changed shape when substrate binds which creates strain on substrate, lowering activation energy
• Active site returns to original shape after products leave

Question 5

Describe properties of enzymes

Answer 5

• Specific due to complementary shape (determined by sequence of amino acids)
• Fast-acting with high turnover rate
• Soluble due to have hydrophilic R-groups on outside of molecule