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Biology
A Level

What occurs during an action potential in a neuron?

At rest, the potential difference between the inside and outside of the neuron is around -70mV. The sodium potassium pump is continually pumping 3 Na+ ions out for every 2 K+ ions it pumps in, and this ma...

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Answered by Sophie C. • Biology tutor
6074 Views

What happens during prophase?

The chromosomes condense and become visible

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Answered by Adam S. • Biology tutor
6814 Views

What is meant by the term polygenic inheritance? [2 marks]

This term refers to the idea that a single characteristic is encoded for my multiple genes at different loci. This gives rise to continuous

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Answered by Odette F. • Biology tutor
7481 Views

What is a reflex arc and how does it work?

A reflex is an unconcious response to a potentially harmful stimulus, such as pulling a tray out of the oven without oven gloves on!

Reflexes bypass the brain an...

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Answered by Polly C. • Biology tutor
7915 Views

How does the citric acid cycle work, and what is oxidative phosphorylation?

The citric acid cycle (AKA the TCA cycle, AKA the Krebs cycle) is an incredibly important set of chemical reactions which is at the centre of how all aerobic organisms function. It is ...

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Answered by Frederick H. • Biology tutor
4967 Views

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