Search our library of Biology A Level questions

Top answers

Biology

A Level

Explain how blood glucose levels are regulated.

Receptors on cells in the islets of Langerhans in the pancreas detect elevated or reduced blood glucose levels. In the case of elevated blood glucose, the beta cells produce insulin, which signals cells t...

Answered by Zoey C. • Biology tutor

1204 Views

Describe the process of synaptic transmission

In order to move and process sensory information electrical signals are sent around the body via specialised cells called neurones. Signals are transmitted between neurones across structures called

Answered by • Biology tutor

1270 Views

Explain how a very high temperature can stop an enzyme from working.

A very high temperature makes the enzyme’s molecules vibrate more. This vibration breaks some of the hydrogen and/ or ionic bonds that hold the enzyme in shape. The active site changes shape and the enzym...

Answered by Veronica G. • Biology tutor

2675 Views

Describe how carbohydrates are broken down.

First the food is broken down into smaller chunks through the process of mastication. This increases the surface area of the food so enzyme activity is more efficient. The salivary gland secretes salivary...

Answered by Ela K. • Biology tutor

1594 Views

What is the difference between competitive and non-competitive inhibition?

A competitive inhibitor has a similar shape to the substrate which an enzyme catalyses. Because of this they block the active site of the enzyme (the site on the enzyme that is complementary in shape to a...

Answered by Austin I. • Biology tutor

1216 Views