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DNA is a very long molecule (one cell contains about 2 metres of DNA!), meaning its coiled structure around proteins called histones allows it to fit into the small space of the nucleus. It also ...
An action potential from the axon arrives at the presynaptic neuron, stimulating voltage-gated calcium (Ca2+) ion channels to open. This allows calcium ions to diffuse into the synaptic knob, c...
Answer: water, followed by hydrogen fluroide, ammonia and lowest is methane.
Explanation: First it helps to write the molecular formulae of these molecules and know their shape:
One of the biggest jumps between GCSE and A Level is the volume of reading that you have to do. Of Mice and Men becomes Jane Eyre; Tess of the D'Urbervilles; Birdsong, or the Handmaid's Ta...
A good place to start is making things simple.
For paragraphs, this means understanding clearly what is expected. Once you know that, then you can focus on getting your b...
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