A measure of the amount of change that occurs per unit of time.

A measure of the quantity of a dissolved substance in a given volume of solution.

The conditions under which the maximum rate of reaction occurs.

A permanent change in the shape of an enzyme that stops it from working properly.

Effects of substrate concentration and temperature on rate of enzyme activity

Combined science

Biological molecules

Tests for biological molecules

Obtaining the elements needed to make biological molecules

Enzymes: function, structure and specificity

The effect of pH on the rate of an enzyme reaction: plan

The effect of pH on the rate of an enzyme reaction: practical

The effect of pH on the rate of an enzyme reaction: data analysis

Pupils will learn how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of the human body.

Pupils learned about differences in the cell structures of eukaryotic and prokaryotic organisms.

This unit explores the roles of sugars, amino acids, and fatty acids in the synthesis and breakdown of biological molecules. It covers enzyme action, transport in organisms, hypothesis development, and data interpretation. Emphasis is on planning experiments and presenting explanations.

Biological molecules and enzymes

Physical activity and equipment requiring safe use

True or false? The concentration of substrate will affect the rate of reaction.

At high temperatures the shape of the enzyme's active site can change, and it no longer fits the substrate. We say the enzyme has become ...

there are fewer successful collisions so the reaction rate is lower.

all active sites are full and reaction rate is as high as it can be.

the enzyme is denatured. The reaction cannot be catalysed.

Which part of an enzyme does the substrate need to collide with for a reaction to take place?

how long it took for the reaction to finish

how much product is formed per unit of time

Below are two graphs showing the rates of enzyme facilitated reactions. Match the graph to the factor affecting the rate of reaction.

True or false? Enzymes can affect the rate of a reaction.

Enzymes {{}} the amount of activation energy needed for a reaction to take place.

What region on an enzyme does the substrate bind to?

the substrate is like a lock and the enzyme is like a key

What can be said about the shape of the active site and the substrate shape?

the enzyme is free to catalyse another reaction

Put the steps in order to show how an enzyme works.

Content guidance

Risk assessment required - equipment

Adult supervision required

Starter Quiz