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Explain and contrast the differences between plant and animal cells.

Taken from AQA specification learning outcome 4.1.1.2Students should be able to explain how the main sub-cellular structures, including the nucleus, cell membranes, mitochondria, chloroplasts in plant cells ...
GK
Answered by Gabby K. • Biology tutor
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How useful is Source A as as evidence about the electoral system before 1832?

[Source A] 'The fact is that yesterday morning I was elected by one voter to represent this ancient borough in Parliament. There was no other candidate and no opposition. On Friday morning I shall leave this...
SL
Answered by Sam L. • History tutor
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Solve the following simultaneous equations: A. 2x-2y=18 and B. 3x+y=23

Step 1: Rearrange one equation to make y the subject. In equation B, we can move the 3x to the other side, making it negative and making the equation y=23-3xStep 2: Substitute our new value for y into equati...
SM
Answered by Sahil M. • Maths tutor
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The probability that it rains on a given day is 0.15. The probability that a football match is cancelled when it rains is 0.65. If it doesn't rain, the probability that the match is not cancelled is 0.95. What is the chance that the match is cancelled?

The aim here is to find the probability that the football match is cancelled in both the case that it rains and in the case that it doesn't. This helps to break the question down; we can find the probability...
MT
Answered by Matthew T. • Maths tutor
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What is a mole

A mole is a unit of 'amount of stuff' and is equal to 6.022x10 23 . It is such a big number because we use the mole to describe how many atoms we have of something, so instead of saying "I have 6.022x10...
TM
Answered by Taylor M. • Chemistry tutor
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