Enzymes

Question 1

Lock and key model

Answer 1

substrate binds to active site (of enzyme protein) ,

(because) shape of active site and substrate are complementary

a chemical reaction occurs to produce smaller molecules or bigger

Question 2

How does temperature affect enzyme reaction(PH same)

Answer 2

Enzymes work fastest at their ‘optimum temperature’ – in the human body, the optimum temperature is 37⁰C

Heating to high temperatures (beyond the optimum) will start to break the bonds that hold the enzyme together – the enzyme will start to d lose its shape – this reduces the effectiveness of substrate binding to the active site reducing the activity of the enzyme

Eventually, the shape of the active site is lost completely and the enzyme is described as being ‘denatured’
Substrates cannot fit into denatured enzymes as the specific shape of their active site has been lost

Question 3

Metabolism

Answer 3

Metabolism is the sum of all the reactions happening in a cell or organism, in which molecules are synthesised (made) or broken down

Question 4

Why does more temp increase rate of reaction

Answer 4

Substrate and catalyst have more kinetic energy so ore collisions lead more substrate turned into product