WJEC A Level Chemistry
WJEC A Level Chemistry 4.7 Amino Acids, Peptides and Proteins Exam Questions
Free WJEC A Level Chemistry exam questions on 4.7 Amino Acids, Peptides and Proteins, with mark schemes. Covers amino acid structure, zwitterions, peptide bonds, protein structure and chromatography.
4.7 Amino Acids, Peptides and Proteins exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Chemistry 4.7 Amino Acids, Peptides and Proteins
This topic covers the chemistry of proteins.
What you need to know
- Amino acids Amine and carboxylic acid groups; zwitterions at the isoelectric point.
- Peptides Condensation forms peptide bonds; hydrolysis breaks them.
- Protein structure Primary, secondary, tertiary and quaternary.
- Chromatography Separating amino acids by paper or thin-layer chromatography and Rf values.
Common mistakes in 4.7 Amino Acids, Peptides and Proteins
- Drawing the zwitterion with incorrect charges.
- Saying hydrolysis needs a dehydrating agent.
- Miscalculating Rf values.
Try three 4.7 Amino Acids, Peptides and Proteins exam-style questions
1. Define a zwitterion. (1 mark)
Show the mark scheme answer
An ion with both positive and negative charges but no overall charge.
2. Calculate an Rf value if the spot moves 3.0 cm and the solvent 7.5 cm. (1 mark)
Show the mark scheme answer
0.40.
3. State the conditions for protein hydrolysis. (1 mark)
Show the mark scheme answer
Heat with concentrated hydrochloric acid.
4.7 Amino Acids, Peptides and Proteins FAQs
What does this topic cover?
Amino acids, peptides, protein structure and chromatography.
Which practical links here?
Thin-layer chromatography of amino acids.
Why are some amino acids optically active?
They have a chiral carbon.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
