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Describe the function of enzymes DNA helicase and DNA polymerase during DNA replication (2 marks)

DNA replication occurs in two phases: DNA separation (DNA helicase) and DNA transcription (DNA polymerase)
Enzyme Function:
1. DNA helicase – (unwinding ...

Answered by Ben J. • Biology tutor

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What is the sequence of events for muscle contraction?

· The myosin head attaches to the myosin binding site on the actin filament forming an actinomyosin bridge· ATP is hydrolysed to ADP and inorga...

Answered by Letisha B. • Biology tutor

36573 Views

How does insulin contribute to the regulation of blood glucose control?

When high levels of glucose are detected in the blood, for example after a big meal, insulin is released from beta cells in the Islet of Langerhans. These are clusters of cells present in the pancreas.

Answered by Leah C. • Biology tutor

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How do we know whether our results indicate whether or not there is a relationship between our variables?

We can test for 'significance' in order to determine whether it's likely that the results that we see are due to random chance or due to a relationship between them. This involves using a statistical test...

Answered by HENRY S. • Biology tutor

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"The war crisis was the primary factor behind the emergence of government by Terror in 1793" How far do you agree?

This is a classic A level History question from one of the most examined(and most-difficult) parts of the French Revolution course. The important thing here is not to panic, and to break it down. Step 1 w...

Answered by Ben H. • History tutor

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