Enzyme Action

Question 1

What are enzymes?

Answer 1

Tertiary structure proteins that catalyse reactions
Large molecules but only small part of it is involved in catalysing, the active site

Question 2

Enzymes active site and substrate

Answer 2

Active site is specific and unique in shape due to specific folding and bonding in the tertiary structure
Due to this they can only attach to substrates that are complementary
Enzyme-substrate complex

Question 3

How do envy,es catalyse a reaction ?

Answer 3

Require certain amount of energy - activation energy
When enzymes attach to substrate lower the activation energy needed for the reaction to occur so speed up reaction

Question 4

Enzyme lock and key model

Answer 4

Enzyme=lock, substrate= key that fits into lock due to complementary shape
Suggests enzyme active site is a fixed shape that substrate collides with and attaches to enzyme
This forms an enzyme-substrate complex
Once complex formed charged groups, active site distorts the substrate so lowers activation energy.
Released then enzyme is ready to be reused

Question 5

Enzyme induced fit model

Answer 5

Enzyme active site slightly changes shape to mould around the substrate
This put strain on the bonds so lowers activation energy
Products are then removed and enzyme active site returns to its original shape