enzymes

• what is digestion?


  breakdown of large insoluble foods into smaller soluble molecules that can be absorbed into our blood
• What is an enzyme?

  A type of protien molecule
• what is an enzyme?

  a type of protein molecules a biological catalyst - increases a speed of chemical reaaction without being used up each type catalyses a specific reaction
• how do enzymes work?

  substrate binds into enzyme's active site cause shape of substrate and active site is copplementary this causes a chemical reaction products are released from the unchanged enzyme
• why can each enzyme catalyse a specif reaction


  each enzyme has a specific active site only a substrate with a copplementary shape can fit
• How are products of digestion used in the body?

  fatty acids+ glycerol: to build new lipids simple sugars: to build new carbohydrates some glucose is used in respiration Amino acid: to make new protein
• what is the role of bile?

  emulsifies fats by converting larger lipid drophlets into smaller drophlets by: increasing the surface area for the lipase enzyme to work at so it can digest/ breakdown faster
• what is role of bile?

  is alkaline so neutralises HCl from stromach to create optimum conditions for small intestine enzymes
• what does it mean when an enzyme denatures?

  active site changes shape so substrate no longer binds/ fits and reaction can no longer be catalysed
• How temperature affects enzyme activity

  1. As temp increases up to optimum temp, rate of reaction increases

  2. As temp increases above optimum temp, rate of reaction decreases
• As temperature increases


  Molecules gain kinetic energy so more frequent enzyme/substrate collisions
• As temperature increases above optimum temp


  Enzyme denatures so substrate no longer fits