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What happens in prophase of mitosis?

The chromosomes condense and the nuclear membrane breaks down and the nucleolus disappears.
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Answered by Lucy O. • Biology tutor
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Describe the structures of proteins.

Proteins are made up of the primary structure, secondary structure and tertiary structure. Some proteins may also have a quaternary structure. The primary structure is the specific sequence of amino acids, p...
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Answered by Lucy O. • Biology tutor
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Explain what happens at a synapse with the use of a labelled diagram

The electrical signal arrives at the first neuron. Neurotransmitters are released into cleft.They diffuse across the cleft and bind to receptors on the 2nd neuron.Electrical impulse is generated in second ne...
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Answered by Connor F. • Biology tutor
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Describe two differences between mitochondria and prokaryotic cells such as bacteria?

Mitochondria: (statements should be comparative)Has a double membrane;No cell wall;No capsule;No flagellum/ pili;No mesosome;No plasmids
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Answered by Abigail G. • Biology tutor
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Contrast the processes of facilitated diffusion and active transport. (3 marks)

Facilitated diffusion involves the use of channel and carrier proteins to assist the diffusion of molecules or ions down a concentration gradient, as this is a passive process it does not require ATP (the un...
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Answered by Holly T. • Biology tutor
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