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What are the differences and similarities between eukaryotic and prokaryotic cells?

There are two types of cell called Eukaryotic cells and Prokaryotic cells. Eukaryotes are organisms made up of eukaryotic cells which include animals, plants and fungi (you can remember this as YOU are a EU-...
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Answered by Alice F. • Biology tutor
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Describe the functional importance of the heart as a pump

The heart made up of four chambers; two atria at the top and two ventricles at the bottom. There are effectively two pumps. The pump on the right side of the heart sends blood to the lungs to be oxygenated. ...
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Answered by Emily W. • Biology tutor
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Explain how the trunk of an elephant evolved using Darwin's theory of natural selection, and then Lamarck's theory.

According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, so longer-nosed elephants are mo...
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Answered by Katie P. • Biology tutor
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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...
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Answered by Jessica W. • Biology tutor
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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 pumps pump out 3Na+ fo...
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Answered by Jessica W. • Biology tutor
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