Biological molecules — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

3 Which chemical element is found in proteins, but not in carbohydrates or fats? A carbon B hydrogen C oxygen D nitrogen

1 marks

Answer: D

This question in 0973/11 May/June 2019

3 A food contains reducing sugar, but no starch. What colours will be obtained if samples of the food are tested with Benedict’s solution and with iodine solution? Benedict’s test iodine test A blue blue-black B blue brown C red-orange blue-black D red-orange brown

1 marks

Answer: D

This question in 0973/11 May/June 2020

3 A food contains reducing sugar, but no starch. What colours will be obtained if samples of the food are tested with Benedict’s solution and with iodine solution? Benedict’s test iodine test A blue blue-black B blue brown C red-orange blue-black D red-orange brown

1 marks

Answer: D

This question in 0973/12 May/June 2020

4 Which smaller molecules make up enzymes? A amino acids B fatty acids C glucose D glycerol

1 marks

Answer: A

This question in 0973/12 May/June 2020

3 Nutrient molecules are made up from smaller molecules. Nutrients can be identified by food tests. Which row is true for a protein? smaller molecules test which gives a positive result A amino acids Benedict’s test B amino acids biuret test C sugars Benedict’s test D sugars biuret test

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2020

3 Which row matches the nutrient to the chemical elements that it contains? nutrient carbon hydrogen oxygen nitrogen A fat v v x x B protein Jv J Jv Jv Cc starch v x v v D sugar x v v v key / = contains element X = does not contain element

1 marks

Answer: B

This question in 0973/12 May/June 2021

4 Which type of molecule are enzymes? A fat B carbohydrate C protein D DNA

1 marks

Answer: C

This question in 0973/12 May/June 2021

3 Which row shows a large molecule and a basic unit from which it is made? large molecule basic unit A glycogen amino acid B glycogen glucose C oil amino acid D oil glucose

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2021

3 Which small molecules are joined together to make a starch molecule? A amino acids B fatty acids C glucose D glycerol

1 marks

Answer: C

This question in 0973/11 May/June 2022

3 Which reagent is used to test for the presence of protein in a food sample? A Benedict’s solution B biuret C ethanol D iodine

1 marks

Answer: B

This question in 0973/12 May/June 2022

3 Glycerol is a component of which large molecules? A fats B glycogen C proteins D starch

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2022

4 Which elements can be found in an enzyme molecule? 1 carbon 2 nitrogen 3 oxygen A 1, 2 and 3 B 1 and 3 only C 1 only D 2 only

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2022

3 Linoleic acid is a fatty acid. Which larger molecule may contain linoleic acid? A glycogen B oil C protein D starch

1 marks

Answer: B

This question in 0973/11 May/June 2023

4 Which type of molecule are enzymes? A amino acids B carbohydrates C fats D proteins

1 marks

Answer: D

This question in 0973/11 May/June 2023

3 Which row shows the elements and the small molecules that are used to make the larger molecules? small larger elements molecule molecule A carbon, hydrogen and oxygen glucose fats B carbon, hydrogen, oxygen and nitrogen amino acids fats C carbon, hydrogen and oxygen glucose proteins D carbon, hydrogen, oxygen and nitrogen amino acids proteins

1 marks

Answer: D

This question in 0973/12 May/June 2023

3 Which colour does Benedict’s solution change to when heated with a reducing sugar? A blue B blue-black C orange D purple

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2023

3 Which smaller molecules make up larger fat molecules? A glucose and amino acids B glucose and fatty acids C glycerol and amino acids D glycerol and fatty acids

1 marks

Answer: D

This question in 0973/11 May/June 2024

3 Three food tests are carried out on a sample of food. The results are shown. food test final colour Benedict’s blue biuret blue iodine blue-black From these results, which nutrient is in the food? A reducing sugar B protein C starch D fat

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2024

4 Which molecules make up fats and oils? A amino acids and glycerol B fatty acids and glycerol C glucose and amino acids D glucose and fatty acids

1 marks

Answer: B

This question in 0973/11 May/June 2025

5 Which type of molecules are enzymes? A carbohydrates B fats C hormones D proteins

1 marks

Answer: D

This question in 0973/11 May/June 2025

4 Which statements about enzymes are correct? 1 Enzymes are biological catalysts. 2 Enzymes are made of fat. 3 Enzymes are made of protein. A 1 and 2 B 1 and 3 C 1 only D 3 only

1 marks

Answer: B

This question in 0973/12 May/June 2025

4 Which row represents a food that contains a reducing sugar and a fat? purple with orange with milky-white blue-black with biuret reagent Benedict’s solution with ethanol iodine solution A yes no no yes B yes no yes no C no yes no yes D no yes yes no

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2025