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Leaving Cert Biology: Biomolecules

How often Biomolecules comes up on the Biology papers, every year it was asked, and questions to try.

HL Asked on 10 of the last 10 Higher Level papers, most recently in 2026. banker

OL Asked on 9 of the last 10 Ordinary Level papers, most recently in 2026. banker

June 2027 is the first exam on the new Biology course. These come from the 2016–2026 papers, so read them as a guide.

Biomolecules, Higher Level(6 marks)

Quick ones on Biomolecules.

(a)Monomers of proteins?
  1. Fatty acids
  2. Amino acids
  3. Nucleotides
(b)Storage carbohydrate in animals?
  1. Cellulose
  2. Starch
  3. Glycogen
(c)Element in all proteins but not in carbohydrates?
  1. Nitrogen
  2. Oxygen
  3. Carbon
Show the answers

(a) Amino acids

(b) Glycogen

(c) Nitrogen

Your turn: Higher Level questions on Biomolecules.

Higher Level

Asked on 10 of the last 10 Higher Level papers, most recently in 2026. banker

Every paper, year by year

YearWhere it came up
2026Q1
2025Q1
2024Q1
2023Q1
2022Q1
2021Q1
2019Q1
2018Q1
2017Q1
2016Q2

Links open the State Examinations Commission’s paper for that year.

More Biomolecules questions

Biomolecules, 2 marks

Building complex molecules from simpler ones, using energy?

  1. Catabolism
  2. Digestion
  3. Anabolism
Show the answer

Anabolism

E.g. photosynthesis and protein synthesis. It needs an energy input, often from ATP. The opposite is catabolism.

Biomolecules, 2 marks

Breaking complex molecules into simpler ones, releasing energy?

  1. Photosynthesis
  2. Catabolism
  3. Anabolism
Show the answer

Catabolism

E.g. respiration and digestion. The energy released can be used to make ATP.

Biomolecules, 2 marks

Fibrous protein found in hair and nails?

  1. Keratin
  2. Amylase
  3. Insulin
Show the answer

Keratin

Keratin is a fibrous (structural) protein made of long, strong strands. Enzymes are globular proteins, folded into a ball shape.

Ordinary Level

Asked on 9 of the last 10 Ordinary Level papers, most recently in 2026. banker

Every paper, year by year

YearWhere it came up
2026Q1
2025Q1
2024Q1
2023Q1
2022Q1
2021Q1
2019Q1
2018Q1
2017Q1
2016Not asked

Links open the State Examinations Commission’s paper for that year.

More Biomolecules questions

Biomolecules, 2 marks

The building blocks of proteins are called?

  1. Fatty acids
  2. Monosaccharides
  3. Amino acids
Show the answer

Amino acids

Amino acids link in a chain like beads to form a protein. Fatty acids belong to fats; monosaccharides belong to carbohydrates.

Biomolecules, 2 marks

Glucose and fructose are examples of?

  1. Amino acids
  2. Monosaccharides
  3. Polysaccharides
Show the answer

Monosaccharides

Mono means one, so a monosaccharide is a single sugar unit. Poly means many, as in starch and cellulose.

Biomolecules, 3 marks

Sucrose is an example of which type of carbohydrate?

  1. A disaccharide
  2. A monosaccharide
  3. A polysaccharide
Show the answer

A disaccharide

Di means two: sucrose is glucose joined to fructose. It is ordinary table sugar.

Other Biology topics

All of Leaving Cert Biology