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Biology
A Level

What are the different steps of aerobic respiration?

Respiration can be broken down into four main stages: glycolysis, the link reaction, the Krebs cycle (or citric acid cycle), and the electron transport chain. Glycolysis is the process through which gluco...

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Answered by Isabel C. Biology tutor
3858 Views

Why does anaerobic respiration have a lower ATP yield than aerobic respiration? (4 marks)

During anaerobic respiration only glycolysis can occur as oxygen is not present to act as the final electron acceptor in oxidative phosphorylation, therefore only substrate level phosphorylation can occur...

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Answered by Amy D. Biology tutor
7581 Views

Outline the action of B lymphocytes following initial contact with an antigen or antigen presenting cell. (6 marks)

There are 4 stages to the response of B lymphocytes upon contact with antigens. These are antigen presentation, clonal selection, clonal expansion and differentiation. During antigen presentation the lymp...

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Answered by Amy D. Biology tutor
2235 Views

Describe the structure of a protein and how it determines its function.

The primary structure of a protein consists of a sequence of amino acids joined together by peptide bonds. This is known as a polypeptide chain, which undergoes the most basic level of folding in the shap...

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Answered by Khuzaima B. Biology tutor
2551 Views

Determine the Michaelis-Menten constant from a graph. Compare the affinities of two enzymes that have different Km values. Explain how a competitive inhibitor works and influence Km and Vmax values.

(a) First of all, we have to determine Vmax by using the graph provided. Try drawing a straight line parallel to the x-axis that is very close to the graph and almost s...

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