Biology (GCSE)

• An enzyme is a biological catalyst that speed up the rate of a chemical reaction.
• A catalyst is a substance which changes the rate of a chemical reaction without being changed itself
• An active site is a special site in the structure of an enzyme where the substrate binds.
• Which organs produce amylase?

  Pancreas, Mouth and small intestine
• Which organs produce protease?

  Stomach, Pancreas and small intestine
• Which organs produce lipase?

  Pancreas and small intestine
• What do protease enzymes do?

  Break down proteins into amino acids
• What do amylase enzymes do?

  Break down carbohydrates into sugar (e.g. glucose)
• What do lipase enzymes do?

  Break down fats + oils into glycerol + fatty acids
• What's a tissue?

  Groups of cells that have a similar structure and have a specific function
• What's an organ?

  A collection of tissues to perform a function
• What's an organ system?

  A group of tissues and organs working together
• The advantages of an electron microscope are:

  • high magnification
• The disadvantages of an electron microscope are:

  • high resolution

  • expensive

  • large in size