Learning objective
Relate the structures of starch, glycogen and cellulose to their functions in plant and animal cells.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Topic
Biological molecules official content
Subtopic
Carbohydrates
Study support
Understand this objective
Quick explanation
Relate the structures of starch, glycogen and cellulose to their functions in plant and animal cells
- This point belongs to Biological molecules official content, especially Carbohydrates.
- You need to be able to relate the structures of starch, glycogen and cellulose to their functions in plant and animal cells.
- The key ideas to know are cellulose, starch, and glycogen.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Carbohydrates to exam-style questions, flashcards, and revision notes for Biological molecules official content.
Quick student answer
Which of the following correctly describes the structure of cellulose?
Direct answer
A linear chain of β-glucose molecules linked by 1,4 glycosidic bonds
Key terms
- Glycosidic bond: A covalent bond formed between two monosaccharides during a condensation reaction, resulting in the formation of a disaccharide or polysaccharide.
- Polysaccharide: A carbohydrate polymer consisting of long chains of monosaccharide units linked by glycosidic bonds, serving various functions such as energy storage and structural support.
Common trap
Confusing starch and cellulose: Remember that starch is composed of α-glucose and is used for energy storage, while cellulose is made of β-glucose and provides structural support.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define monomers as smaller units from which larger molecules are made.
Monomers and polymers
- Define polymers as molecules made from many monomers joined together.
Monomers and polymers
- Identify monosaccharides, amino acids and nucleotides as examples of monomers.
Monomers and polymers
- Distinguish condensation reactions from hydrolysis reactions using bond formation, bond breaking and water.
Monomers and polymers
- Describe monosaccharides as monomers from which larger carbohydrates are made.
Carbohydrates