Digestive system Flashcards
(34 cards)
What are the main organs of the digestive system
Mouth salivary gland gullets stomach liver pancreas gal bladder small intestine large intestine rectum anus
What is a nutrient
A substance needed for growth repair and metabolism
What are the three main nutrients
Protein carbohydrates lipids
What gases do lipids contain
Carbon hydrogen oxygen
What gases do carbohydrates contain
Carbon hydrogen oxygen
What gases do proteins contain
Carbon hydrogen oxygen and nitrogen
What do you use to test for starch
Iodine
What colour is starch at the beginning and end of the test
Beginning yellow brown
End blue black
What do you use to test for sugar
Add Benedict’s and boil
What colour is the sugar test at the start and end
Start blue
End orange red
What do you use to test for protein
Add biuret to starch
What colour is protein at the start and end of test
Start blue
End purple
What do you test lipids with
Mix with ethanol filter it and add to water
What colour are lipids at the start and end of the test
Start clear
End cloudy
What are enzymes made of
Protein
What is a catalyst
Speeding up the chemical reaction with out getting used up
What do enzymes act on
Substrates
What is the active site
The part of an enzyme that one or more substrates molecules can attach to
What is a substrate
What the enzyme is working on
What is the enzyme that works on the substrate protein
Protease
What is an enzyme
A biological catalyst that is specific to one substrate it is protein made out if long chains of amino acids coiled and folded
What is the enzyme that works on the substrate fat
Lipase
What is the enzyme that works on the substrate starch
Amylase
What are the three stages of a enzyme and substrate
1 the enzyme has a specific shape and active site only specific substrates will fit into the active site 2 the enzyme and substrate together form a substrate complex 3 the reaction takes place and new products are released from the enzyme the enzyme is ready to react with another substrate
