Studied by 28 people
Carbohydrates consist of…
Carbon
Hydrogen
Oxygen
Lipids consist of…
Carbon
Hydrogen
Oxygen
Proteins consist of…
Carbon
Hydrogen
Oxygen
Nitrogen
What are complex carbohydrates made of?
Long chains of simple single units
What is cellulose used for?
Cellulose is used for support in plants
Fats and oils are classed as…
Lipids
Which is the most efficient energy store?
Lipids
Are lipids soluble in water?
No
Which of these statements is true about lipids?
a. Made up of 3 molecules of glucose joined to 1 molecule of fatty acid
b. Made up of 3 molecules of fatty acids joined to 1 molecule of glycerol
c. Made up of 3 molecules of glycerol joined to 1 molecule of fatty acid
b. Made up of 3 molecules of fatty acids joined to 1 molecule of glucose
b. Made up of 3 molecules of fatty acids joined to 1 molecule of glycerol
What decided whether a lipid is a solid or a liquid?
Fatty acids
What are proteins used for?
Building cells
Building tissues
How much of the body is protein?
15 - 16%
What foods consist of high protein levels?
Meat
Fish
Pulses
Cheese
What consists of long chains of amino acids?
Proteins
What are protein bonds sensitive to?
pH
Temperature
Name the 2 tests for carbohydrates
Iodine test for starch
Benedict’s solution test for sugars
Describe the colour change of iodine in the presence of starch
Yellow / red iodine turns blue / black
Describe the colour change of iodine in the presence of proteins
No change
Describe the colour change of iodine in the presence of lipids
No change
Describe the colour change of Benedict’s solution in the presence of sugars
Blue Benedict’s solution turns brick red (when heated)
Describe the colour change of Benedict’s solution in the presence of lipids
No change
Describe the colour change of Benedict’s solution in the presence of proteins
No change
Name the solution used in testing for the presence of lipids
Ethanol
Describe the colour change of ethanol in the presence of lipids
Colourless ethanol turns cloudy white
Describe the colour change of ethanol in the presence of sugars
No change
Describe the colour change of ethanol in the presence of proteins
No change
Name the solution used in testing for the presence of proteins
Biuret reagent
Describe the colour change of Biuret reagent in the presence of proteins
Blue Biuret solution turns purple
Describe the colour change of Biuret reagent in the presence of lipids
No change
Describe the colour change of Biuret reagent in the presence of starch
No change
Note 
Flashcard (22)