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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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Show that the two lines are parallel: L1: 4y = 24x +12, L2: 2y + 13 = 12x

Two lines are parallel when they have the same gradient. When the equation is written in the form: y = mx + c, m is the gradient. We need to arrange our equations in the form y = mx + c as this is the easies...
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Answered by Dominique T. • Maths tutor
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Simplify fully:6y2 +7y - 6y - 4 - 3y2

Simplify: 6y 2 +7y - 6y - 4 - 3y 2 The first step is to group the terms of the equation into y 2 terms, y terms and terms with no y: This gives, 6y 2 -3y 2 + 7y - 6y - 4 Next we are going to look at each ter...
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Answered by Dominique T. • Maths tutor
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