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Unit 4: Organic Chemistry and Analysis
Quick questions on Amines and amino acids - WJEC A-Level Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are amphoteric behaviour of amino acids?Show answer
Because an amino acid carries both an acidic and a basic group, it reacts with both acids and bases, behaving amphoterically. With acid the amino group is protonated; with base the carboxyl group is deprotonated. The pH that gives the neutral zwitterion is the isoelectric point, and at this pH the amino acid does not migrate in an electric field, the basis of separating amino acids by electrophoresis.
What are proteins and enzymes?Show answer
Sequences of amino acids joined by peptide bonds fold into proteins and enzymes; the order of residues determines structure and function, the chemistry behind all biology. Nylon and Kevlar. Industrial polyamides made by condensation of diamines and diacids give strong fibres used in clothing, ropes and body armour, the synthetic parallel of proteins.
What is q1?Show answer
State why ethylamine is a stronger base than ammonia. [1 mark]
What is q2?Show answer
Draw the zwitterion of glycine. [1 mark]
What is q3?Show answer
Name the type of bond formed between two amino acids. [1 mark]
What is q4?Show answer
State the reagent used to reduce a nitrile to a primary amine. [1 mark]
What is q5?Show answer
State why an amino acid does not migrate in an electric field at its isoelectric point. [1 mark]
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