GCSE BIO ENZYMES

Question 1

What is a catalyst?

Answer 1

catalysts increase the rate of chemical reactions without changing themselves. Enzymes are a biological catalysts

Question 2

What does it mean if an enzyme is denatured?

Answer 2

If an enzyme has become denatured then it has passed its optimum reaction temperature. This high temperature causes the chain of amino acid to unravel (denature) consequently changing the shape of the active site making it ineffective as a catalyst.

Question 3

What affects the activity of an enzyme ?

Answer 3

PH and Temperature

Question 4

Define a Catalyst

Answer 4

a substance that speeds up a chemical reaction without being changed itself.

Question 5

Define an Enzyme

Answer 5

a biological catalyst made of protein

Question 6

What is a protein?

Answer 6

proteins are large molecules composed of one or more LONG CHAINS OF AMINO ACIDS and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, etc., and as enzymes and antibodies.

Question 7

How do enzymes speed up reactions in your body?

Answer 7

Enzymes such as; React with substrates; to produce;
Amylase starch → sugars
Protease proteins → amino acids
Lipase lipids → fatty acids + glycerol

Question 8

What is a substrate ??

Answer 8

A substrate is the reactant in the reaction between it and the enzyme they fit the enzymes active site like a lock and key.