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How can donepezil improve communication between nerve cells?

Donepezil is an inhibitor of the enzyme acetylcholinesterase. Acetylcholine is a neurotransmitter that diffuses across synapses, binds to the acetylcholine receptor and causes sodium ion channels to open. In...
SW
Answered by Sarah W. • Biology tutor
6424 Views

Nitrates and phosphates from fertiliser applied to crops may enter ponds and lakes. Explain how nitrate may cause the death of fish in fresh water.

Plants need three main nutrients to grow, which can be helpfully abbreviated as NPK: that's nitrates, phosphates and potassium. Many gardeners and farmers will apply these fertilisers to crops in order to in...
IC
Answered by Imogen C. • Biology tutor
7935 Views

Explain how a mutation in DNA could cause a non functioning enzyme to be formed

A mutation could change the order of DNA bases which would alter the type of amino acid produced from a DNA triplet. Therefore, the enzyme, which is a protein, formed from these amino acids would be differen...
HW
Answered by Hannah W. • Biology tutor
10163 Views

How does ATP fuel reactions?

ATP releases energy when it is converted to ADP and iP by ATP lyase. It REQUIRES energy to create that phosphate bond and so the bond can be viewed as the store of energy. ATP lyase breaks this and release e...
RC
Answered by Rebecca C. • Biology tutor
3548 Views

Describe the pathway of an electrical signal in producing a response to a stimulus

Stimulus is detected by a recepttor e.g. the skin- Electrical signals travel from receptor to Central nervous System (CNS) via sensory neurones- CNS coordinates a response to the stimuli- CNS sends electrica...
AA
Answered by Aleena A. • Biology tutor
3498 Views