Biological molecules — IGCSE Sciences - Co-Ordinated (0973) questions by topic
Biological molecules questions identify which food groups contain only carbon, hydrogen and oxygen, name a larger molecule containing linoleic acid, state the colour change of Benedict's solution with a reducing sugar, and identify the molecules making up fats and oils, worth from 1 to 9 marks.
Identify, construct and deduce are the only top command words in this IGCSE Co-ordinated Sciences topic: deduce a food group from its constituent elements, not from appearance. 13 real questions from 2023 to 2025 papers sit below. Submitting each answer for instant marking checks whether a molecule, such as glucose or a fatty acid, is correctly matched to its larger compound.
May–June 2025, Paper 11
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
Answer this question and get it marked →May–June 2025, Paper 21
Which result with the biuret test shows that protein is present? A blue B green C orange D purple
Answer this question and get it marked →May–June 2025, Paper 22
Which row shows a large molecule and the small molecule it is made from? large molecule small molecule --- --- --- A glycogen glucose B glycogen amino acid C oil amino acid D oil…
Answer this question and get it marked →May–June 2025, Paper 62
Fig. 2.1 shows the notes made by the student. Fig. 2.1 (student's notes): "Solution A tests positive with Benedict's solution and negative with biuret solution and iodine…
Answer this question and get it marked →May–June 2024, Paper 11
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
Answer this question and get it marked →May–June 2024, Paper 21
A sample of food is tested for reducing sugars by adding Benedict's solution and heating. What indicates that reducing sugars are present? A a blue-black colour B a brick-red…
Answer this question and get it marked →May–June 2024, Paper 22
Analysis of a large food molecule shows that it contains the elements carbon, hydrogen and oxygen only. Which food groups could this molecule be from? A carbohydrates and fats…
Answer this question and get it marked →May–June 2023, Paper 11
Linoleic acid is a fatty acid. Which larger molecule may contain linoleic acid? A glycogen B oil C protein D starch
Answer this question and get it marked →May–June 2023, Paper 12
Which row shows the elements and the small molecules that are used to make the larger molecules? A elements: carbon, hydrogen and oxygen; small molecule: glucose; larger molecule:…
Answer this question and get it marked →May–June 2023, Paper 21
Linoleic acid is a fatty acid. Which larger molecule may contain linoleic acid? A glycogen B oil C protein D starch
Answer this question and get it marked →May–June 2023, Paper 22
Which row shows the elements and the small molecules that are used to make the larger molecules? A elements: carbon, hydrogen and oxygen; small molecule: glucose; larger molecule:…
Answer this question and get it marked →October–November 2023, Paper 11
Which colour does Benedict's solution change to when heated with a reducing sugar? A blue B blue-black C orange D purple
Answer this question and get it marked →October–November 2023, Paper 21
Which colour does Benedict's solution change to when heated with a reducing sugar? A blue B blue-black C orange D purple
Answer this question and get it marked →Other IGCSE Sciences - Co-Ordinated topics
- Motion, forces and energy (77)
- Electricity and magnetism (65)
- Practical skills (60)
- Organic chemistry (40)
- Waves (40)
- Atoms, elements and compounds (29)
- Organisms and their environment (28)
- Stoichiometry (24)
- Chemical reactions (22)
- The Periodic Table (22)
- Human nutrition (21)
- Reproduction (21)