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How does vaccination prevent illness?

When a person is vaccinated, a small amount of dead or inactive pathogen (that they are being vaccinated against) is introduced into their body. This stimulates the white blood cells to produce antibodies.Th...
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Answered by Freya T. • Biology tutor
2903 Views

What are some differences between RNA and DNA?

RNA is single stranded, whereas DNA is double stranded. RNA has a uracil base instead of DNA's thymine base. RNA has a ribose sugar, whereas DNA has a deoxyribose sugar.
HG
Answered by Holly G. • Biology tutor
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How is blood pumped around the heart and to the body?

The pumping of the heart is split into two main phases, diastole (relaxation) and systole (contraction) and involves the four main chambers of the heart, the atria and ventricles, as well as the associated v...
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Answered by Rhiannon J. • Biology tutor
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Explain how gaseous exchange occurs in the lungs

Oxygen enters the nose/mouth along the trachea, bronchi, bronchioles and finally into the alveoli.The exchange of gases occurs between the alveoli and blood in the capillaries that supply the lungs. Capillar...
TD
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What are the differences between plant and animal cells?

For your GCSE, you need to know that there are three main differences between plant and animal cells:Plant cells have a cellulose cell wall while animal cells do not.Plant cells have chloroplasts while anima...
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Answered by Yara A. • Biology tutor
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