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Describe the sodium-potassium ion pump on cell plasma membranes (2 marks)

These pumps use ATP / active transport to move 3 sodium ions (Na + ) out of the cell for every two potassium ions (K + ) that move in.1 mark - idea of active transport / use of ATP1 mark - idea of 3 Na + and...
AA
Answered by Aarif A. • Biology tutor
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Describe the process of DNA replication.

DNA helicase unwinds the DNA double strand / causing hydrogen bonds between complimentary base pairs to break / both single strands used as templates / DNA replication is semi conservative and semi discontin...
LZ
Answered by Leia Z. • Biology tutor
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Describe the Darwinian theory of natural selection (GCSE/A-Level)

Every individual of every species living on the planet has DNA, made up of sections called genes. Mutations to these genes occur over time, resulting in a change to an individual's behaviour or physiology. T...
BD
Answered by Bill D. • Biology tutor
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What’s the difference between a eukaryote and a prokaryote?

A prokaryote will not contain membrane-bound organelles, whereas a eukaryotic cell will contain membrane-bound organelles.Examples of membrane bound organelles would be the nucleus, mitochondria and chloropl...
CM
Answered by Camilla M. • Biology tutor
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Explain the advantages of sexual reproduction in plants

A major advantage of sexual reproduction is the increased genetic diversity that it creates. This originates from novel genetic combinations that result from meiosis and the fusing of the gametes thus produc...
IB
Answered by Iain B. • Biology tutor
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