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Biology
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Explain the process of natural selection.

Mutation, meiosis and sexual reproduction causes variation amoung members of the same species. Species tend to produce more offspring than the environment can support leading to competition for food or pr...

Answered by Jessica W. Biology tutor
2022 Views

Explain how a nerve impulse passes along a neuron (8 marks)

Neurons transmit electrical impulses. Electrical impulses are action potentials propagated along the axons of neurons from one end to another. At a resting potential, sodium-potassium pum...

Answered by Jessica W. Biology tutor
17775 Views

Give examples which show how red blood cells are able to transport oxygen around the body efficiently

The haemoglobin in red blood cells carries oxygen. - Red Blood cells are flattened biconcave disc shapes which means they have a large surface area to carry oxygen. - They are small cells so can fit into ...

Answered by Emma C. Biology tutor
1914 Views

Explain how a mutation in the genetic code leads to a dysfunctional enzyme.

Mutations are a random change in the nucleotide sequence in a genome. Genes code for proteins, such as enzymes, and are found in the genome. When a change in the nucleotide sequence within a gene happens,...

Answered by Benjamin T. Biology tutor
3256 Views

Describe the reflex arc from the point of a receptor detecting a stimulus.

Receptor triggers a sensory neuron to fire an electrical impulse. Synapses with relay neuron which fires an electrical impulse. Synapses with motor neuron which fires an electrical impulse. The motor neur...

Answered by Annabel L. Biology tutor
2077 Views

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