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WorksheetsChapter 4: Biological Molecules
Total questions: 20
Worksheet time: 20mins
Which simple molecules are the basic units of protein?
amino acids
fatty acids
glucose
vitamins
Small molecules are used as the basic units in the synthesis of large food molecules.
Which statement is correct?
Amino acids are basic units of carbohydrates.
Fatty acids are basic units of glycogen.
Glycerol is a basic unit of oils.
Simple sugar is a basic unit of protein.
Which nutrient produces a purple colour when mixed with Biuret solution?
fat
protein
reducing sugar
starch
The diagram shows two food tests carried out on solution X.
Which nutrients are present in solution X?
protein and starch
protein and sugar
starch and fat
starch and sugar
A student set up a test-tube containing starch, water and amylase.
How could the student test whether the amylase had digested all the starch?
Add Biuret solution.
Add dilute hydrochloric acid.
Add iodine solution.
Weigh the test-tubes and contents before and after the experiment.
When solution X is tested with iodine solution, a blue-black colour is observed.
A different solution, Y, is added to a new sample of solution X and the mixture is shaken and left for 30 minutes at 40°C.
When tested with iodine solution again, an orange-brown colour is observed. What are solutions X and Y?
X=maltose, Y=amylase
X=maltose, Y=lipase
X=starch, Y=amylase
X=starch, Y=lipase
Water is a good solvent.
What does this mean?
It dissolves well in many other substances.
It flows easily through vessels.
It is permeable to gases.
Many substances dissolve well in it.
Which elements do carbohydrates contain?
carbon, hydrogen and oxygen
carbon, hydrogen and sulphur
carbon, nitrogen and oxygen
carbon, nitrogen and sulphur
Which of the following is NOT a reducing sugar?
lactose
sucrose
maltose
glucose
Which of the following the example of monosaccharides?
starch
sucrose
glucose
cellulose
A student tested a food sample X using Benedict's solution and he observed a red precipitate was formed in the solution.
What does food sample X contain?
protein
lipid
starch
glucose
What will you observe in the positive test for starch?
The brown solution turns purple.
The brown solution turns blue black.
The blue solution turns purple.
The blue solution turns blue black.
When a solution is tested with ethanol, a formation of milky-white emulsion indicates the presence of ___________ in the sample.
protein
fats
sugars
starch
The diagram represents a protein molecule.
What do the small circles represent?
fatty acids
amino acids
glycerol
simple sugars
A biological polymer that stores and transmits genetic information is a ..........
nucleic acid
carbohydrate
protein
lipid
What is the primary function of carbohydrates in your body?
speeds up chemical reactions
source of energy through cellular respiration
build cell walls in plants
heat insulation
Which macromolecule is shown in the diagram above?
lipid
nucleic acid
protein
carbohydrate
When a substance is added to meat, amino acids are produced.
What is this substance?
an enzyme
a hormone
oil
water
What will you observe from a positive test of lipids?
a red precipitate will form
a purple solution will form
a blue black solution will form
a cloudy-white emulsion will form
What are the four nitrogenous bases in DNA?
A, T, C, U
A, G, T, B
A, T, C, G
A, C, G, D
