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How do vaccinations work? Why don't they cause disease?

A vaccine is a weakened form of the disease causing bacteria injected in to the patient. The person then develops immunity to that bacteria and so when they are infected with the bacteria, they are able to q...
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Answered by Acrisa K. • Biology tutor
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How is the concentration of blood and urine controlled by the body? (6 marker)

Concentration of urine is controlled by the hormone ADH (anti-diuretic hormone)This hormone is released into the bloodstream; by the posterior pituitary glandIf the water concentration in the blood is too hi...
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Answered by Rayyan A. • Biology tutor
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Explain how a mutation in DNA could cause a non functioning enzyme to be formed

A mutation could change the order of DNA bases which would alter the type of amino acid produced from a DNA triplet. Therefore, the enzyme, which is a protein, formed from these amino acids would be differen...
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Answered by Hannah W. • Biology tutor
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Describe the pathway of an electrical signal in producing a response to a stimulus

Stimulus is detected by a recepttor e.g. the skin- Electrical signals travel from receptor to Central nervous System (CNS) via sensory neurones- CNS coordinates a response to the stimuli- CNS sends electrica...
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Answered by Aleena A. • Biology tutor
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1a) Give 3 structures that an animal cell would contain and describe their function? 1b) Name 3 different structures that a plant cell contains which an animal cell would not.

1a) Nucleus: Contains the genetic material of the cellCell membrane: controls what can enter and leave the cell. Also will hold the cell togetherCytoplasm: Where cell reactions take place 1b) Cell wall, Vacu...
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Answered by Aleena A. • Biology tutor
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