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What are the enzymes involved at each stage during DNA replication?

The initial ‘unzipping’ stage is carried out by DNA helicase , to create a fork of DNA with exposed base pairs. DNA helicase works by breaking the hydrogen bonds between base pairs. On the leading strand, a ...
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Answered by Alice G. • Biology tutor
5574 Views

Explain how an action potential is transmitted from one neurone to another at a synapse.

A good answer would start with a definition of a synapse ('the junction between two neurones') and then be formatted as bullet points or numbers for clarity and backed up with a diagram. Action potentia l ar...
EK
Answered by Emily K. • Biology tutor
3170 Views

Explain the role of ADH in regulating the water potential of the blood.

Firstly, a description of water potential would be a good place to start. An example definition of this could be: the pressure created by water molecules. The greater the number of water molecules present, t...
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Answered by Ruby H. • Biology tutor
17963 Views

How are signals transmitted across a neuromuscular junction?

Calcium ions enter the presynaptic terminal via voltage gated calcium channels, once the presynaptic terminal is depolarised by an action potential.Calcium ions stimulate vesicles to fuse with the presynapti...
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Answered by Ishan J. • Biology tutor
3012 Views

Explain the process of synaptic transmission

An action potential reaches the presynaptic neurone. This causes calcium channels to open, leading to calcium ions entering the synaptic knob via facilitated diffusion. This causes synaptic vesicles containi...
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Answered by Thomas K. • Biology tutor
3386 Views