B1 Enzymes OCR Gateway (9-1)

?
  • Created by: Aleena
  • Created on: 03-04-18 17:47
What are the 3 main factors that affect the rate of an enzyme-controlled reaction?
Temperature, pH,Concentration
1 of 11
How does temperature affect the rate of an enzyme-controlled reaction?
Higher temperature-increases R of R,at first, enzymes & substrate move about more,so more likely to meet up & react. If too hot, enzymes become denatured as the bonds holding enzyme break down-loses its shape substrate doesn't fit into active site
2 of 11
Is denaturing reversible?
no, even if enzyme cools down-it permanently remains denatured
3 of 11
If enzyme becomes denatured it can longer do what?
Enzyme can longer catalyse reaction so reaction stops
4 of 11
What is the name for the best temperature the enzyme works best at?
The Optimum temperature-when reaction goes the fastest
5 of 11
In humans, what is the optimum temperature for most of the important enzymes
37*C-the same temperature as our bodies
6 of 11
How does pH affect the rate of an enzyme-controlled reaction?
If pH too high or low-interferes with bonds holding enzyme together -changes shape of active site & can irreversibly denature the enzyme
7 of 11
what is the common optimum pH for enzymes?
7(neutral)
8 of 11
What is the optimum pH for the enzyme Pepsin?
pH 2 - because it is an enzyme in the stomach, used to break down proteins, so this means it is well suited to the acidic conditions in the stomach
9 of 11
How does Enzyme Concentration affect the rate of an enzyme-controlled reaction?
The more enzymes in a solution, more likely a substrate will meet up with one and react with it-increasing R of R. But if substrate is limited, there comes a point when there's more enzyme than substrate-so there's no further effect
10 of 11
How does the Substrate Concentration affect the rate of an enzyme-controlled reaction?
The higer the substrate concentration-more likely it meets up with an enzyme-increases R of R. But only true up to a point,after that there's too many substrates for enzymes to catalyse,adding more substrate has no longer any effect-active sites full
11 of 11

Other cards in this set

Card 2

Front

How does temperature affect the rate of an enzyme-controlled reaction?

Back

Higher temperature-increases R of R,at first, enzymes & substrate move about more,so more likely to meet up & react. If too hot, enzymes become denatured as the bonds holding enzyme break down-loses its shape substrate doesn't fit into active site

Card 3

Front

Is denaturing reversible?

Back

Preview of the front of card 3

Card 4

Front

If enzyme becomes denatured it can longer do what?

Back

Preview of the front of card 4

Card 5

Front

What is the name for the best temperature the enzyme works best at?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Enzymes and digestion resources »