Digestion (AQA GCSE Biology): Flashcards
📚Flashcards
Practise the cards
14 cards from this deck
ShowHide
Practise the cards
14 cards from this deck
What do qualitative tests show?
What do qualitative tests show?
IF a substance is present, not how much
Reagent used to test for reducing sugars
Reagent used to test for reducing sugars
Benedict's solution
Reagent used to test for starch
Reagent used to test for starch
Iodine solution
Reagent used to test for lipids
Reagent used to test for lipids
Sudan III stain
Reagent used to test for proteins
Reagent used to test for proteins
Biuret reagent
Benedict's test positive color change
Benedict's test positive color change
Blue to green/orange/red
Iodine test positive color change
Iodine test positive color change
Orange-brown to blue-black
Sudan III test positive result
Sudan III test positive result
Red upper layer forms
Biuret test positive color change
Biuret test positive color change
Blue to pink or purple
Examples of reducing sugars
Examples of reducing sugars
Glucose and fructose
How to prepare food samples
How to prepare food samples
Mix with 2cm³ distilled water; cut/grind large pieces first
Benedict's test heating time
Benedict's test heating time
5 minutes in hot water bath
Key safety property of ethanol
Key safety property of ethanol
Highly flammable
Safer heating method than Bunsen burner
Safer heating method than Bunsen burner
Hot water bath