Enzymes

An enzyme lowers the:

• 1 Substrate mass
• 2 Activation energy
• 3 Temperature
• 4 Product mass

A competitive inhibitor:

• 1 Increases the rate
• 2 Binds elsewhere on the enzyme
• 3 Is a substrate
• 4 Binds to the active site

The optimum pH of pepsin is about:

• 1 9
• 2 7
• 3 2
• 4 12

A non protein part that helps an enzyme to work is a:

• 1 Product
• 2 Cofactor
• 3 Hormone
• 4 Substrate

Increasing substrate concentration increases the rate of an enzyme reaction until:

• 1 The product stops forming
• 2 The temperature falls
• 3 All enzyme active sites are occupied
• 4 The pH rises

The part of an enzyme where the substrate binds is the:

• 1 Cofactor
• 2 Allosteric site only
• 3 Active site
• 4 Coenzyme

Enzymes work best at:

• 1 Very high temperature
• 2 Their optimum pH and temperature
• 3 Any pH
• 4 Very low pH

Which of these is not true about enzymes?

• 1 They are specific
• 2 They are proteins
• 3 They are used up in reactions
• 4 They lower activation energy