How does temperature influence enzyme reactions?

Question 1

What impact does a increase in temperature have on chemical reactions

Answer 1

• It increases the rate of chemical reactions
  *

Question 2

How does a rise in temperature lead to an increase in the rate of chemical reactions

Answer 2

• A rise in temperature
• Leads to a rise in kinetic energy
• Which in turn increases the probability that the particles moving in gas or liquids will collide
• Causing a chemical reaction to occur

Question 3

Would a contiuous rise in temperature lead to a continous increase in the rate of chemical reaction

Answer 3

• No this only happens upto a specific temperature point
  
  • i.e. the optimum temperature

Question 4

What is the name give to the temperature where no further increase in the rate chemical reactions occur

Answer 4

• Optimum temperature

Question 5

What is the temperature coefficient Q₁₀

Answer 5

rate of reaction at T + 10⁰C

Q_{10 = ————————————————–}

rate of reaction at T

Note to Jamie - Check out the box on page 33 of the advanced biology book - Important!

Question 6

What else happens when there is a rise in temperature

Answer 6

• As kinetic energy increases
• The molecule itself starts to vibrate
• The hydrogen bonds are broken
• The 3D shape of the protein changes and therefore also the function
• The changes are permanent
• When this occurs the enzyme is described as Denatured

Question 7

What is the name given to an enzyme where the tertiary structure (3D shape) is changed owing to a rise in temperature

Answer 7

• Denatured

Question 8

What happens if the temperature falls below the optimum temperature

Answer 8

• The enzyme becomes inactivated until it warms up again.