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 force of attraction between atoms in a compound.

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

Explaining effects of substrate concentration and temperature on enzyme rate

Combined science

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

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.

As temperature increases, molecules move faster as they have more energy.

The rate of reaction increases, to its optimum.

The bonds holding the enzyme molecules together start to break. 

The enzyme's active site changes shape and the substrate no longer fits.

The rate of reaction slows to zero as all the enzyme molecules become denatured.

Put these steps in order to show what happens as the temperature of an enzyme controlled reaction increases.

Where on the graph is the substrate concentration greater than the enzyme concentration?

Where on the graph could the enzyme concentration be greater than substrate concentration?

What region on an enzyme does the substrate bind to?

The enzyme is free to catalyse another reaction.

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

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

The shape of the active site is {{}} to the substrate.

Exit Quiz

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