AQA · Chemistry · 8462
GCSE Chemistry (AQA): Naturally Occurring Polymers
Topic 7 — Organic Chemistry. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Naturally Occurring Polymers - Polypeptides, DNA, and Carbohydrates (2026/27 exams)"; each card deep-links to the moment in the video it came from. Lesson 7.17 of Cognito's AQA GCSE Chemistry (Triple) course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-t_7.17.
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Which monomer is joined together in large numbers to make starch?
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Glucose, a monosaccharide (simple sugar).
What type of reaction joins two amino acids together?
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A condensation reaction — an OH from the carboxyl group and an H from the amino group are lost as water.
Carbohydrate polymers such as starch, cellulose and glycogen are called ?.
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polysaccharides
How many different bases are found in DNA nucleotides?
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Four — represented by the letters A, T, G and C.
What is the bond between two amino acids in a polypeptide called?
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An amide bond (also called an amide link or peptide bond), formed between a carbon and a nitrogen.
When is a polypeptide called a protein?
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When it folds up, or combines with other polypeptides.
Which two functional groups are found in every amino acid?
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An amino group and a carboxyl (carboxylic acid) group, joined by a central carbon.
The part of an amino acid that differs between one amino acid and another is the ?.
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R group
How many polymer chains make up a DNA molecule, and what shape do they form?
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Two chains, linked together and coiled into a double helix.
Which three elements are carbohydrates made from?
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Carbon, hydrogen and oxygen only.
Which monomers join together to form a polypeptide?
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Amino acids.
What is a polymer?
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A long chain made of many small repeating molecules called monomers.
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