1.7 - Enzyme Action

Question 1

Induced Fit Model of the Enzyme:

Answer 1

AS forms as enzyme and substrate interact
* the enzyme moulds itself around the substrate
* as it changes shape, the enzyme puts a strain on the substrate molecule which distorts a particular bond in the substrate which lowers the AE to break the bond

Question 2

What is the structure of an enzyme? (shape, AS, and what does the active site act upon and what is the substrate molecule held by within the AS)

Answer 2

• Has a specific 3D shape
  has a functional active site
• acts upon the substrate and forms an ES complex
  substrate molecule is held within the AS by bonds that temporarily form between certain amino acids of the AS and the substrate

Question 3

What do enzymes do to the activation energy?

Answer 3

lower it allowing it to occur at a lower temperature by providing an alternate pathway without being used up

Question 4

Conditions for a chemical reaction:

Answer 4

• two particles must collide with sufficient energy to alter the arrangement of their atoms
• free energy of the products must be less than that of the substrates
• activation energy for the reaction to initialise

Question 5

What type of proteins are enzymes and what do they act as and what is their function?

Answer 5

• Globular proteins
• act as biological catalysts
• alter the rate of chemical reaction without being used up (speed up)