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A Level

Why would a cell lyse when it's in water?

Lysis, or the bursting of a cell, happens because of a cell swelling excessively causing it to burst, due to the movement of water into the cell by osmosis. However, this isn't the case for all cells!

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AA
Answered by Ashar A. Biology tutor
18340 Views

What is an electron volt?

Electron volts, like joules, are a unit of energy. This may sound confusing- why two? But think of it this way; length has two possible units- metric (metres) and imperial (inches). We can use either unit...

NM
Answered by Nicholas M. Physics tutor
23462 Views

How do I build up and retain a sufficient level of vocabulary?

The need to build up a sufficient level of vocabulary and retain it is extremely important when taking on the written and oral componants of the A level exams both when it comes to to comprehension and ex...

JE
Answered by Joshua E. French tutor
1888 Views

How does Synaptic Transmission work?

The brain is made up of structures alled neurons, which acts processed and sends information through electircal impulses. Because neurons do not touch eachother, hese electrical impulses are sent through ...

ZS
Answered by Zara S. Psychology tutor
2791 Views

What are Descartes' three waves of doubt and his response to it?

Descartes went through three increasingly strong arguments in an attempt to bring doubt to every single thing that he knew. The first is the argument from illusion, in which he suggests that his senses ma...

AB
Answered by Adam B. Philosophy tutor
43886 Views

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