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Explain the process of DNA replication (6 marks).

The parental DNA is unwound from its double helix structure . DNA Helicase enzymes break hydrogen bonds between the bases of the parental DNA. DNA polymerase enzymes add free nucleotides to the daughter stra...
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Answered by Gerald H. • Biology tutor
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simplify fully: (3x^2 - 8x -3)/(2x^2 -6x)

First of all, to simplify this fraction, we need to factorise the top and bottom equations. We shall start with the top equation. Now looking at the equation: 3x 2 - 8x -3, we know that it's a quadratic with...
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Answered by Amanda H. • Maths tutor
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Prove that the product of 3 consecutive integers is divisible by 6

If you set the three consecutive integers to be n, n+1 and n+2, we know that one of the numbers must be divisible by 2 and one must be divisible by 3. For example if you had your three numbers as: 5, 6, 7, o...
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Answered by Shreeya K. • Maths tutor
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Describe how a simple Reflex works.

Reflexes allow you to respond to a stimuli (change in environment). A simple reflex begins with a receptor which are found in sense organs and allow you to detect the stimuli. An example of a sense organ is ...
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Answered by Mira M. • Biology tutor
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(AQA English Language Paper 1 Question 5 - Creative Writing) Write a story with the title, 'The Holiday'. [40 marks]

I never wanted to be here in the first place. After two trains, three buses and hours of car journey we find ourselves in the middle of nowhere. Yesterday we arrived late evening and the whole family was in ...
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Answered by Zoe A. • English tutor
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