1.4 Enzymes

Question 1

What are Enzymes

Answer 1

They are biological catalysts that increase the rate of reaction and lower the activation energy

Question 2

What is the active site of an enzyme

Answer 2

Area of enzyme that the substrate binds to

Question 3

What is the induced fit model

Answer 3

The enzyme will distort so that the active site moulds around the substrate

Question 4

Rate of Reaction + E/S Concentration graph

Answer 4

Rate of Reaction increases until there are more enzymes that substrates or more substrates than enzymes
They become a limiting factor

Question 5

Rate of Reaction + Temp/pH graph

Answer 5

Rate of Reaction increases to optimum
Rate of Reaction decreases beyond the optimum as enzymes will denature
Active site changes shape

Question 6

What is a competitive inhibitor

Answer 6

Binds to the active site of an enzyme
Acts as a competitor for substrate
Slows down rate of reaction for a bit

Question 7

What is a non competitive inhibitor

Answer 7

Binds to the allosteric site of an enzyme
It changes the shape of the active site so substrate + enzyme are no longer complementary
Less ESC’s

Question 8

What is an Intracellular enzyme

Answer 8

Found in animals + plants
Example= DNA ligase

Question 9

What is an extracellular enzyme

Answer 9

Enzymes that have an effect beyond the cell membrane
Example= Digestive enzymes