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Biology
A Level

How do sodium and potassium ions travel through the cell membrane?

the sodium-potassium pump enables the passage of sodium and potassium ions. Both of which must be present. This uses energy as it is done via active transport. They move across their concentration gradien...

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Answered by Megan B. Biology tutor
4403 Views

What happens in the link reaction of respiration?

Pyruvate converts to Acetylcoenzyme A in an oxidation reaction. Pyruvate and coenzyme A combine to form acetylcoenzyme A. One of pyruvate's 3 carbon atoms goes to form a molecule of carbon dioxide, which ...

MB
Answered by Megan B. Biology tutor
5245 Views

How do I approach the 8-10 mark questions on a paper?

Firstly, don't panic! These questions are always either a description of a process (so you can learn it off by heart), or an analysis of information that is given to you. Although it's not advisable to wr...

LC
Answered by Lydia C. Biology tutor
10705 Views

Please could you explain Oxidative Phosphorylation?

I like to approach this in 6 steps, but you could also draw this as a diagram if you find that more helpful. All the words in capital letters are needed to get the credit in an exam: 1)NADH and FADH are R...

LC
Answered by Lydia C. Biology tutor
3089 Views

What is the difference between B-cells and T-cells in the immune system?

B-cells and T-cells are both able to react to specific pathogens, but do this in different ways. B-cells produce antibodies that can bind to the pathogen. T-cells have a few functions: they can kill host ...

KM
Answered by Kelsey M. Biology tutor
6780 Views

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