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Describe mechanisms used by the body to prevent entry of pathogens

Mucous in the trachea traps pathogens Microorganisms in food are killed by stomach acidThe skin forms a physical barrier against pathogens
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Answered by Obioma N. • Biology tutor
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Describe the differences between noncompetitive and competitive inhibition of enzymes.

The key differences here are where the inhibitor binds to the enzyme, competitive bind to the active site and as such compete directly with the normal substrate of the enzyme. Noncompetitive bind to a site o...
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Answered by Thomas B. • Biology tutor
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The MMR vaccine gives protection against measles, mumps and rubella. How? (4 marks)

. Vaccine contains antigens from the pathogens . This is recognised by helper T cells which activates other helper T cells and B cells . B cells undergo clonal selection and produce memory + plasma cells . P...
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Answered by Mohit V. • Biology tutor
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Describe the differences and similarities between diffusion and osmosis.

Diffusion and osmosis both describe the net movement of molecules down a concentration gradient, resulting in an even spread of the molecule over an area over time. Osmosis, however, is more specific as it r...
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Answered by Patrick S. • Biology tutor
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Explain how a change in the primary structure may result in a non functional enzyme

A change in the primary structure means there has been a change in the amino acid sequence.This may cause different hydrogen bonding to occur, leading to a different secondary structure.This may lead to diff...
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Answered by Sanskriti S. • Biology tutor
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