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Biology
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Occasionally a baby can be born with a hole in the wall that separates the left and right ventricles of the heart. Using your knowledge of blood circulation, explain the consequences of this condition.

Blood will flow between the right and left ventricles. This means that both sides of the heart will contain a mixture of oxygenated and deoxygenated blood. Therefore, the blood sent around the body via th...

MK
Answered by Mary K. Biology tutor
7769 Views

Explain how temperature affects how enzymes work

Definition of enzymes: Biological catalysts that speed up the rate of reaction by lowering the activation energy , with no effect on equilibrium. They are proteins that have a specific shape . For the enz...

GR
Answered by Giulia R. Biology tutor
9432 Views

Is it true that once we reach adulthood we never produce new neurons?

The short answer is no, this is a false statemement. There are two areas in the brain which undergo adult neurogenesis after adolescence. These is the subventricular zone of the lateral ...

EB
Answered by Ebrahim B. Biology tutor
2742 Views

Explain the lock and key model of enzyme action, including how they are denatured. [6 marks]

The first step is to read the question and ensure that the student understands all of the terminology. For example, make sure the student knows what is meant by ‘explain’, ‘enzyme’, and ‘denatured’. Then ...

BH
Answered by Bryony H. Biology tutor
11905 Views

Briefly describe how a vaccine works.

A vaccine is a dead or attenuated (weakened) form the pathogen. When injected into the host, the antigens on the surface of the pathogen generate an immune response. This stimulates the production of whit...

KP
Answered by Krishan P. Biology tutor
3500 Views

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