Top answers

Biology
A Level

How does DNA undergo replication?

Firstly, the enzyme DNA Helicase breaks the hydrogen bonds present between base pairs. This allows the DNA double helix to unravel, exposing the DNA bases. Free DNA nucleotides then bond to the exposed ba...

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Answered by Victoria O. Biology tutor
5904 Views

How does adrenaline, using the second messenger model, cause glycogenolysis?

First of all, it is best to understand what glycogenolysis actually is. It is the breakdown of glycogen to form glucose and can be used by the liver to combat low blood glucose levels.
Firstly, adre...

Answered by Biology tutor
19851 Views

explain how a diet high in salt can increase risk of developing cardiovascular disease (5 marks)

Diet high in salt increases risk of cardiovascular disease high salt diet raises BPwhich increases risk of atherosclerosis increasing the risk of inflammatory responseincreasing the risk of plaque formati...

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Answered by Georgia E. Biology tutor
4174 Views

Describe the process of translation (4-6 mark)

mRNA moves out of nucleus and attaches to ribosomet. RNA carrying amino-acids bind by their anticodons to the mRNA - by complementary base pairing. Another molecule of tRNA with another ...

Answered by Biology tutor
21458 Views

Explain the steps leading up to muscle contraction

At the axon terminal of a motor neurone, an action potential arrives and triggers an influx of calcium ions. These calcium ions cause vesicles containing Acetylcholine (a neurotransmitter that works on ch...

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Answered by Arianna R. Biology tutor
2637 Views

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