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Biology
A Level

Describe the structure of proteins

Proteins are polymers of amino acids, formed by long chains of amino acids joined together by peptide bonds. These bonds are formed by condensation reactions which allow two single amino acid molecules...

JH
Answered by Jena H. • Biology tutor
61869 Views

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...

SC
Answered by Sophie C. • Biology tutor
5727 Views

What happens during prophase?

The chromosomes condense and become visible

AS
Answered by Adam S. • Biology tutor
6571 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

OF
Answered by Odette F. • Biology tutor
7196 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...

PC
Answered by Polly C. • Biology tutor
7505 Views

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