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Describe the process of phagocytosis and how antigen presentation leads to antibody production (9 marks)

White cell (macrophage/neutrophil) detects bacteria antigen by binding to cell surface receptorsWhite cell engulfs bacteria (this is endocytosis), bacteria is held in a phagosome Lysosomes enter phagosome an...
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Answered by Caine R. • Biology tutor
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Describe how the body adapts the solute pressure of the blood (thorough its use of ADH) after a person has drank a large volume of water.

Located at the base of the hypothalamus is the pituitary gland which contains osmoreceptor cells that sense the solute potential of the blood and release ADH in response to changes of the solute potential. I...
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Answered by Daniel D. • Biology tutor
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Describe and explain how the small intestine is adapted for its function?

The small intestine contains microvilli which increase the surface area of the membrane. It also has a rich blood supply, this maintains the concentration gradient. The small intestine has a membrane which i...
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Answered by Uma I. • Biology tutor
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What are some key components within the cell surface membrane, and what are their functions?

The cell surface membrane is formed of a phospholipid bilayer, in which the hydrophillic phosphate heads point outwards and the hydrophobic tails point inwards. This forms a barrier for large molecules such ...
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Answered by Maria K. • Biology tutor
3280 Views

What is an immobilised enzyme and what are the advantages of their use?

Immobilised enzymes are enzymes that have been trapped into an inert matrix or material (such as calcium alginate) which prevents them from moving during the reaction process. Whole cells such as yeast and b...
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Answered by Rooban S. • Biology tutor
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