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Explain the process of ventilation in human lungs.

Ventilation is movement of air into and out of lungs;
volume of thorax/lungs/chest increased/decreased;
pressure in thorax/lungs/chest decreased/increased;

air flows from higher to lowe...

Answered by Anahita K. • Biology tutor

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Explain which are the main costituents of carbohydrates and their structure

Carbohydrates, as the word says, are made up of Carbon, Oxygen and Hydrogen. They are commonly known as suggarsand are present in different forms in some kind of foods. We can divide them in different gr...

Answered by Sara M. • Biology tutor

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Prior to cell division, cells replicate. Explain the process of DNA replication in prokaryotes.

Prokaryotic DNA is different to eukaryotic DNA in that prokaryotic DNA is circular, and thus has an origin of replication. When replication starts, it starts at this origin and occurs

Answered by Molina D. • Biology tutor

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Compare and contrast prokaryotic and eukaryotic cells in terms of the structural organization of their genetic material.

The major cellular feature which sets the distinction between a prokaryotic (‘pro’ – before, ‘karyon’ – kernel, nucleus) cell and a eukaryotic (‘eu’ – true, ‘karyon’ – kernel, nucleus) cell is the presenc...

Answered by Michaela D. • Biology tutor

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Explain a chemical synaptic transmission

Nerve impulses are transmitted along the axon by saltatory propagation. This is where the wave of depolarisation jumps across to small gaps known as nodes of ranvier, dramatically reducing the time taken ...

Answered by James A. • Biology tutor

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