Enzymes

biological catalyst

An enzyme is a(n) ________- this means they speed up a reaction without being used up themselves.

Enzymes

________ are proteins and so, are made up of long chains of amino acids.

active site

When it binds to the ________, the substrate fits into the enzyme to form an enzyme- substrate complex.

catalyst

A(n) ________ is a substance that speeds up the rate of reaction but remains unchanged at the end of the reaction.

Catalase

________ and pepsin are types of enzymes.

Hydrogen peroxide

________ is a harmful chemical found in all cells.

chemical reaction

The molecules involved in a(n) ________ in a cell are- Substrate- The substance that an enzyme acts on.

Egg white suspension

________ is cloudy because it has large protein molecules in it.

Enzyme activity

________ is affected by temperature and ph.

temperature

Changes in ________ and pH can cause changes in the shape of an enzymes active site.

Properties of enzymes

________- speed up chemical reactions, not changed by reaction.

breakdown of hydrogen peroxide

An enzyme called catalase speeds up the ________ into oxygen and water.

enzyme

The ________ is like a lock, and the substrate is like a key.

Enzymes

________ work around ph7 anything above and below optimum change the ________ shape meaning it has denatured.

Enzymes

________ are made of protein.

Enzyme

________- The catalyst that speeds up the reaction.

Enzymes

________ are involved in many reactions in living things and your body.

Enzymes

________ are active over a narrow range of pH values.

An enzyme is a biological catalyst

this means they speed up a reaction without being used up themselves

Properties of enzymes

speed up chemical reactions, not changed by reaction

Break down large molecules into smaller ones e.g., digestion

breakdown of food molecules

Enzyme

The catalyst that speeds up the reaction

Product

The substance(s) produced

Practical 1

Catalase activity in different tissues

Practical 1

Method

Practical 2

Specificity of enzymes

Practical 2

Method

Tube A

2 cm3 hydrogen peroxide solution and 1 cm3 of catalase and 2 drops of detergent

Tube B

2 cm3 hydrogen peroxide solution and 1 cm3 of pepsin and 2 drops of 1 mol hydrochloric acid

Tube C

2 cm3 egg white suspension and 1 cm3 of catalase and 2 drops of detergent

Tube D

2 cm3 egg white suspension and 1 cm3 of pepsin and 2 drops of 1 mol hydrochloric acid

If the shape of the active site changes too much the enzyme will be denatured

it will be inactive

Practical 3

Enzymes and temperature