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How does a vaccine work?

A vaccine contains a dead or inactive (an therefore harmless) form of a pathogen. By injecting this into the body, an immune response is triggered and white blood cells produce antibodies specific to the ant...
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Answered by Tianna P. • Biology tutor
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How do bacteria develop antibiotic resistance?

So when we give an antibiotic (a drug that kills bacteria) it will kill all of the bacteria that are sensitive to it, if it's taken correctly. A few bacteria may have an adaptation allowing them to resist an...
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Answered by Charlotte N. • Biology tutor
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How is body temperature regulated in mammals?

When it’s too hot, vasodilation occurs, in which the capillaries near the surface of the skin increase in diameter, allowing more blood to flow through them, releasing heat. Hairs on the skin lie flat. The s...
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Answered by Aylin L. • Biology tutor
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How is a leaf adapted for photosynthesis?

Leaves have a large surface area so more light hits them. The upper epidermis of the leaf is transparent, allowing light to enter the leaf. The palisade cells contain many chloroplasts which allow light to b...
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Answered by Aylin L. • Biology tutor
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Which of the following are found in plant cells but not in animal cells? Mitochondria, Cell Wall, Cell membrane, Chloroplasts, Cytoplasm, Vacuole

The cell wall, chloroplasts and vacuole are found in plant cell rather than animal cells. These components are know as organells of a cell and these organells for a plant are vital for its functionality and ...
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