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How does a vaccine work?

Vaccines contain strains of an attenuated Pathogen. This means there is a dead or inactive form of the virus you are protecting against in the vaccine. This could be a like DNA segments or some lipid membran...
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Answered by Robyn H. • Biology tutor
2547 Views

Describe how pathogens cause infections and describe how the immune system defends itself against these pathogens

Pathogens like viruses and bacteria reproduce rapidly within the body's cells which causes damage. Bacteria particularly may produce toxins which make you feel ill.White blood cells ingest bacteria or virall...
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Answered by Holly M. • Biology tutor
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How do you know which circle theorems to use when answering a question?

Its okay to not know which theorem to use immediately when you look at a question. The best way to go about it if you are struggling is to recall all the ones that you do remember and deduce any angle even i...
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Answered by Steven P. • Maths tutor
2811 Views

Find the solutions to this quadratic equation: 0 = 2x^2 - 5x - 3

First we need to factorise this quadratic. This will be in the form: 0 = (Ax + B)(Cx + D) You can work this out the values of A, B, C and D by looking at the coefficients in the unfactorised form. For exampl...
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Answered by Kathryn B. • Maths tutor
3016 Views

√ (6²+8²) = ∛(125a³) Find a.

6²= 36 8²=6436+64=100√ 100 =10Therefore, 100=∛(125a³)∛(125a³) =∛125 X ∛a³=5 X a =5aSo, 10=5aa=2
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Answered by Sarah M. • Maths tutor
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