Top answers

How does a vaccine prevent infection?

When vaccine is given small amounts of the dead or inactive pathogen are inserted in to the blood, this activates the body's white blood cells which then produce antibodies. These antibodies destroy the dead...
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Answered by Rosie B. • Biology tutor
5206 Views

What is the difference between primary and secondary succession?

Primary succession starts from bare rock , so no soil is present at the start. Over time the pioneer organisms (such as moss and lichen) break the rock and as the organisms die and decompose, the soil builds...
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Answered by Sarah P. • Biology tutor
47855 Views

How is the DNA prepared for it to be replicated?

The preparation occurs to the DNA whilst in the nucleus of the cell. As DNA is a double helix, the two strands of DNA need to be split apart. Therefore the hydrogen bonds need to be broken. The DNA helicase ...
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Answered by Sarah P. • Biology tutor
4564 Views

What is the difference between aerobic respiration and anaerobic respiration?

Respiration is the process by which the body creates energy by breaking down nutrients. This can either happen in the presence of oxygen, or without it. The key difference between the two processes are that ...
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Answered by Alex W. • Biology tutor
15932 Views

What are the similarities and differences between animal and plant cells?

Similarities : Both have a nucleus Both have cytoplasm Both have a cell membrane Both contain mitochondria Both contain ribosomes Differences : Plant cells have a cellulose cell wall Plant cells have a vacuo...
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Answered by Phoebe W. • Biology tutor
20074 Views