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Human Biology
GCSE

Resistance to antibiotics is caused by a mutation. What is a mutation?

A change in the DNA base sequence resulting in a different protein structure.

Answered by Ethan B. Human Biology tutor
3219 Views

Explain why in the heart the wall of the left ventricle is thicker than the wall of the right ventricle?

This is because the left ventricle pumps oxygenated blood round the entire body while the right ventricle only pumps blood to the lungs which is a much shorter distance. Because the left ventricle needs t...

Answered by Katie D. Human Biology tutor
160529 Views

Explain how negative feedback mechanisms help the body achieve homeostasis

Homeostasis at its core simply means the maintenance of balance – the body is said to achieve homeostasis when there is there is a balance between the ever-changing external environment and the relatively...

Answered by Elson M. Human Biology tutor
9134 Views

How does the structure of a ball and socket joint allow it to bring about movement?

This joint allows 360 degree movement, as there is cartilage at the ends of the bones. The joint itself is surrounded by synovial fluid which reduces friction in movement.

Answered by Ashleigh H. Human Biology tutor
6474 Views

What occurs during transcription?

Transcription is the process which makes mRNA in the nucleus. Firstly, the gene uncoils and hydrogen bonds are broken, causing the two strands to separate. One of these strands is the template. RNA nucleo...

Answered by Marina D. Human Biology tutor
9263 Views

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