Top answers

Describe the similarities and differences between DNA and RNA structures

Structurally, DNA and RNA are very similar. They're both composed of a backbone of sugar, a phosphate group and a chemical base. However, the sugar in DNA is a deoxyribose sugar and the sugar in RNA is a rib...
SM
Answered by Shannon M. • Biology tutor
10341 Views

How are action potentials transmitted from one nerve to another?

Action potentials need to be transmitted over the synaptic cleft. This is achieved by the electrical impulse being converted into chemical and then back to electrical. First the action potential reaches the ...
CS
Answered by Craig S. • Biology tutor
3080 Views

Describe and explain how a nerve impulse is transmitted across a cholinergic synapse.

An action potential from the presynaptic neurone arrives at the presynaptic knob. This process causes voltage-gated Calcium ion channels in the presynaptic membrane to open. Calcium ions then diffuse into th...
AL
Answered by Alex L. • Biology tutor
3721 Views

Explain how high absorption of salt from the diet can lead to a build-up of tissue fluid

High absorption of salt from the diet results in a higher than normal concentration of salt (sodium chloride) in the blood plasma entering capillaries. This means that there is a higher concentration of sodi...
AR
Answered by Assen R. • Biology tutor
15460 Views

What is meant by the primary structure of a protein and why is it so important?

The primary structure of a protein is the sequence in which the amino acids are joined. The only bonds involved in the primary structure of a protein are peptide bonds (between the amino acids). Proteins are...
SS
Answered by Shiv S. • Biology tutor
9546 Views