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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 preda...
JW
Answered by Jessica W. • Biology tutor
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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 the...
EC
Answered by Emma C. • Biology tutor
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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, th...
BT
Answered by Benjamin T. • Biology tutor
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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 neuron ...
AL
Answered by Annabel L. • Biology tutor
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Compare the structure of a eukaryote and prokaryote cell.

A prokaryote is a much smaller and simpler cell than a eukaryote, whereas as prokaryote is usually 0.2 to 2.0um eukaryotes are 10-100um. Due to the small size, prokaryotes don't have a nucleus, which also me...
CO
Answered by Cal O. • Biology tutor
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