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WorksheetsBio Revision B5 Biological Molecules
Total questions: 20
Worksheet time: 20mins
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.
When a substance is added to meat, amino acids are produced. What is this substance?
a hormone
an enzyme
an oil
water
The diagram shows part of a protein molecule. What does X represent?
amino acid
fatty acid
glycerol
sugar
The diagram represents a protein molecule. What do the small circles represent?
amino acids
fatty acids
glycerol
simple sugars
Which nutrient produces a purple colour when mixed with biuret solution?
fat
protein
reducing sugar
starch
Which simple molecules are the basic units of protein?
amino acids
fatty acids
sugars
vitamins
Which food-testing reagent shows a positive result when it turns from blue to purple?
Benedict’s solution
biuret reagent
ethanol
iodine solution
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
The diagram shows two food molecules before and after they have been digested by enzymes. What identifies the products of fat digestion?
P and R
P and S
Q and R
Q and S
The graphs show the quantities of selected vitamins and mineral ions in four foods. Which food is the richest source of the vitamin or mineral ions essential for the transport of oxygen by the blood?
beans
egg
fish
fruit
A human cell contains a length of DNA that carries the code for making which substance?
fat
glycogen
lipase
starch
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.
Which pair of substances is transported in the phloem?
amino acids and protein
amino acids and sucrose
protein and starch
starch and sucrose
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.
What does the digestion of starch produce?
fatty acids
glucose
mineral salts
water
The diagram shows part of a starch molecule. Which diagram shows this molecule after it has been completely digested?
Which elements do carbohydrates contain?
carbon, hydrogen and oxygen
carbon, hydrogen and sulphur
carbon, nitrogen and oxygen
carbon, nitrogen and sulphur
List four chemical elements that are found in proteins.
Oxygen, Carbon, Nitrogen and Hydrogen
Carbon, Phosphorus, Hydrogen and Nitrogen
Carbon, Oxygen, Nitrogen and Phosphorus
Oxygen, Carbon, Phosphorus, Hydrogen
Suggest why athletes eat foods high in proteins, during training;
Explain how, during a marathon race, the blood glucose concentration stays fairly constant, but the mass of glycogen in the liver decreases.
