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Explain why an extensive network of capillaries and ventilation of the lungs helps to maximise the effectiveness of gas exchange.

The capillaries deliver blood that has high carbon dioxide levels and low oxygen levels and take away blood that has high oxygen levels and low carbon dioxide levels. This means there is always a concentrati...
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Answered by Annabel C. • Biology tutor
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Name the first stage of mitosis, and describe what happens at this stage

The first stage of mitosis is ProphaseAt prophase...The already duplicated DNA within the nucleus condenses (coils up) to form sister chromatids, connected by a centromereThe nucleolus and nuclear envelope b...
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Answered by Lara Q. • Biology tutor
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What are the similarities and differences between competitive and non-competitive inhibition within enzymes?

Competitive inhibition occurs when the substrate and inhibitor molecule are similar in shape and size and therefor compete to bind in the enzymes active site, non-competitive inhibition however is when the i...
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Answered by Stella W. • Biology tutor
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Explain the process of evolution?

Evolution occurs via a process called natural selection,Natural selection (termed survival of the fittest by Darwin) is where organisms that are better adapted to an environment survive and reproduce. Theref...
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Answered by Stella W. • Biology tutor
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Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction (3 marks)

The question is three marks, so should have three points.1) Active site of the enzyme has a specific shape / tertiary structure / complementary to maltose 2) Only maltose can bind / fit3) Forms an enzyme-sub...
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Answered by Amy W. • Biology tutor
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