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IB Biology | Year 1 (Junior) · Proteins · part 1/7

Amino Acids & Peptide Bonds: How to Draw Them

Amino Acids & Peptide Bonds: How to Draw Them

IB Biology B1.2, proteins: amino acids and peptide bonds (part 1 of 7, for SL and HL). The four parts of every amino acid, how two amino acids join by condensation to form a dipeptide, and how a long chain becomes a polypeptide. Includes how to draw it for full marks.

In this lesson

  1. 0:00 Intro
  2. 0:20 Exam question
  3. 1:00 Warm-up
  4. 1:40 Amino acid structure
  5. 2:36 Peptide bonds
  6. 3:27 Polypeptides
  7. 4:16 Drawing practice
  8. 5:30 What earns the mark
  9. 6:01 Exam question solved
  10. 6:41 Recap
Answers to the practice questions at the end of the video
  1. Two correct amino acids [1]; joined by a bond between the C of the carboxyl group and the N of the amino group [1]; peptide bond labelled [1].
  2. Hydrolysis.
  3. 123.

Questions are original, in the style of the exam; marks are estimates.

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