Organisation Flashcards
What is the order of smallest to largest organs?
cell - tissue - organ - organ system - organism.
What is the test for sugar called and how do you do it?
Benedicts test - add benedicts solution to the food sample, if it is positive the solution would change from blue-green to yellow-red.
What is the test for starch called and how do you do it?
Iodine test - Add iodine solution to the food sample, if it is positive then a blue-black colour would be shown.
What is the test for protein called and how do you do it?
Biuret test - Add biuret solution to the food sample, if it is positive than the solution would change from blue to pink-purple
What is the purpose of the digestive system?
To break down large molecules into smaller soluble molecules, which can be absorbed into the blood stream.
What is an enzyme?
a biological catalyst; speeds up chemical reactions without being changed or used up.
How does an enzyme speed up a chemical reaction?
It lowers the activation energy required for the reaction to occur.
What are enzymes made up of?
chains of amino acids.
What is the lock and key theory?
The active site of an enzyme is structured to fit a specific shaped substrate. If the reactants do not fit the shape then the enzyme can not be used.
What affects the rate of enzymes?
temperature and at specific conditions of pH, if there was an extreme of these, then the enzyme would denature.
What is meant by ‘denature’?
The bonds holding together the 3d shape of the active site will break and the active shape will deform.
What are the digestive enzymes?
carbohydrase (amylase)
protease
lipase
What do carbohydrates break down into?
Carbohydrates break down into simple sugars by carbohydrase.
What do starch break down into?
Starch breaks down into glucose by amylase.
What do proteins break down into?
Proteins break down into amino acids by protease.
