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Biology
A Level

What is a nerve synapse and how does it work?

What is a nerve synapse?

A synapse refers to the junction between two neurons. When an impulse (action potential) reaches the end of a neuron (the pre-synaptic neuron), the synapse allows this sign...

JH
Answered by Jamie H. Biology tutor
8234 Views

Describe the sequence of events that create an action potential

Before an action potential can even start, it is important to remember that there are already uneven concentrations of ions over the membrane. Potassium ions are at a higher concentration inside the cell,...

RJ
Answered by Rebecca J. Biology tutor
51407 Views

What are the features of ATP which lead it to being termed the 'universal currency' of the cell?

Adenosine triphosphate (ATP for short) is used to provide the energy for many cellular functions - by both animal and plant cells - as cells are unable to source their energy directly from sugars such as...

EB
Answered by Edward B. Biology tutor
31121 Views

What are the major similarities between oxidative phosphorylation and non-cyclic photophosphorylation?

In terms of similarities, both processes involve generating a proton electrochemical gradient across a membrane, by pumping protons from an area of lower concentration to a higher concentration. This crea...

OW
Answered by Ollie W. Biology tutor
37440 Views

Why does putting honey on a cut kill the bacteria within it?

The water potential in bacterial cells is higher than that of the honey, meaning that water leaves the bacterial cells by osmosis. This loss of water denatures the bacterial cells as it stops metabolic re...

AH
Answered by Ashleigh H. Biology tutor
4441 Views

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