Top answers

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
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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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Plants require nitrates for growth. To maximise crop yield, farmers utilise techniques such as crop rotation and ploughing of fields prior to planting their seedlings. Explain how the two techniques mentioned improve plant yield:

Plants require nitrates to be up-took via active transport for conversion to amino acids which are used to make proteins for growth. To increase yield, farmers need to increase the nitrates available in the ...
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Answered by Niamh L. • Biology tutor
7691 Views

What is the difference between type 1 and type 2 diabetes?

Type 1 diabetes is where the pancreases produces little or no insulin. This means a person's blood glucose level can rise to a level that can kill them. People with Type 1 diabetes need insulin therapy - thi...
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Answered by Khadija O. • Biology tutor
2540 Views

What is a synapse? Describe how it works.

A synapse is the junction where nerve cells (called neurones) meet. An electrical signal can pass from one neurone to another across the synapse. When the signal reaches the end of the neurone, it causes a c...
IH
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