2.1.4 - Enzymes

Question 1

What type of Proteins are Enzymes?

Answer 1

Globular

Question 2

What structure are enzymes usually found in?

Answer 2

Tertiary

Question 3

Define ‘Anabolic’

Answer 3

Small molecules are assembled into larger ones – requires energy

Question 4

Define ‘Catabolic’

Answer 4

Larger molecules are broken down into smaller ones – releases energy

Question 5

What are the four factors that affect the rate of reaction?

Answer 5

Temperature, pH, Enzyme Concentration, Substrate Concentration.

Question 6

What are the Substrates complementary to?

Answer 6

The Enzyme’s active site.

Question 7

Explain Enzyme-Substrate reactions using collision theory

Answer 7

Molecules of Substrate & Enzymes move and collide randomly. They have kinetic Energy.

For a reaction to occur, Enzyme & Substrate must collide with the correct orientation & energy greater than activation energy.

Question 8

What effect does High Temperature have on the Enzyme-Substrate reaction?

Answer 8

• Increases frequency of collisions
• Increases the number of successful collisions, therefore increasing the overall rate of reaction.
• Increases K.E

Question 9

Dumb down the Lock & Key Hypothesis.

Answer 9

Only a specific substrate will fit into a specific enzyme’s active site