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Express (x+1)/2x + (2x+3)/(x+1) as one term

(x+1) 2 + 2x(2x+3) / 2x(x+1)
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Answered by Alex R. • Maths tutor
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Detail the pathway of oxygenated water in the ventilation of a fish. Name and briefly describe the mechanism by which gaseous exchange takes place.

Oxygen rich water enters the mouth due to buccal expansion > water is accelerated across the gill filaments due to simultaneous contraction of the buccal cavity and expansion of the opercula > gaseous ...
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Answered by Owen F. • Biology tutor
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Using knowledge of the pathogenicity of HIV, explain why it can't be transmitted through inanimate objects or hand shakes with an infected person.

HIV is a virus and therefore obligately intracelluar, with a very short survival time outside of its host.
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Answered by Owen F. • Biology tutor
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How can antibody neutralisation of pathogenic antigens help prevent cellular damage? (4 marks)

Prevent:Antigen attachment to cell > cell invasion > pathogen replication > toxin production.
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Answered by Owen F. • Biology tutor
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Define "cellular immune response".

An immune response mediated by T lymphocytes.
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Answered by Owen F. • Biology tutor
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