What colour does Benedict's solution change to if glucose is present?

brick red

How do you test for starch?

Iodine solution

How do you test for protein?

Add Biuret

How do you test for lipids

Add ethanol and shake, then add water. A cloudy white emulsion forms if lipids are present

What is an enzyme?

A biological catalyst that speeds up reactions without being used up.

What is the active site?

The part of an enzyme where the substrate fits and the reaction occurs.

What happens when an enzyme becomes denatured?

Its active site changes shape, so the substrate can no longer fit.

What was investigated in the amylase practical?

How pH affects the breakdown of starch by amylase.

How is the starch test used in the amylase practical?

Samples are placed on iodine; if it stays orange-brown, all the starch has been broken down.