Top answers

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
6385 Views

There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.

72
CA
Answered by Charlotte A. • Maths tutor
4485 Views

Express 56 as the product of its prime factors

2 3 x 7
CA
Answered by Charlotte A. • Maths tutor
8583 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
7895 Views

Why might the government offer subsidies to the farming industry?

A subsidy is a money transfer from the government to producers in order to increase supply. Subsidies can either be provided on a per unit basis or based on total value of production, an ad valorem subsidy s...
JS
Answered by Joe S. • Economics tutor
4283 Views