Describe the changes undergone by a protein molecule from the time it is swallowed until its structural molecules are used in a cell of the skin.
- Big protein particles are broken down into small particle in the mouth by teeth.
- In the stomach Enzyme pepsin in presence of HCl breaks down proteins into short polypeptide chains
- In duodenum pancreatic protease (trypsin, chymotripsin, carboxy-peptidare and elastase) breaks down proteins and polypeptides into tripeptides and dipeptides.
- Pancreatic juice also contains nucleases which break down nucleic acids into nucleotides and a variety of peptidases which release some free amino acids from polypeptide chains.
- Absorption of amino acids occurs in the small intestines by diffusion and active transport and transport through the liver to the skin
CATEGORIES Bio Questions and answers
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