b3- organisation and the digestive system Flashcards
what is a tissue?
a group of cells with similar structure and function
what is an organ?
a collection of tissues performing specific functions
what is an organ system?
a group of organs that perform specific functions on the body
what are carbohydrates made up of?
units of sugar
what are protein molecules made up of?
chains of amino acids
what do catalysts do?
increase the rate of chemical reactions without chemically changing
what are enzymes?
biological catalysts, they catalyse specific reactions in living organisms due to the shape of their active site. this is the lock and key theory of enzyme action
what are enzymes made up of?
Proteins
The amino acid chains are folded to form the active site, which matches the shape of a specific substrate molecule
what is metabolism?
the sun of all reactions in a cell or body
what affects enzyme activity?
temperature and ph
what does high temperature do to an enzyme?
denature it changing the shape of the active site