Grade 9 Food testing

Which one of the following is the basic unit of proteins?

• fatty acids

• amino acids

• glucose

• glycerol

A food was chemically tested with a solution that changed from yellow to blue/black? Which solution was the food tested with?

• Biuret

• ethanol

• Benedict's

• iodine

Glycerol and fatty acids make up which one of the following food molecules?

• lipids

• simple carbohydrate

• complex carbohydrates

• proteins

If a food is tested with ethanol and then water, what nutrient is the food being tested for?

• proteins

• lipids

• simple sugars

• complex sugars

Starch is an example of what type of food molecule?

• protein

• simple carbohydrate

• complex carbohydrate

• lipid

Which food molecule is being tested for with heating and the use of a blue coloured solution?

• starch

• glucose

• fat

• protein

All complex carbohydrates are made up of long chains of smaller molecules called

• fatty acids

• glycerol

• amino acids

• glucose

Which chemical food test involves a positive result of a cloudy white emulsion?

• protein

• lipid

• glucose

• starch

If glucose is present, which one of the following observations would occur?

• yellow to blue colour change

• blue to orange colour change

• blue to purple colour change

• brown to black colour change

Which one of the following is not one of the three main types of biological molecules that structurally make up cells?

• lipids

• fibre

• proteins

• carbohydrates