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Topic 11Biology

B1.2 Proteins

Proteins from amino acids to four levels of structure, with function determined by 3D shape; AHL extends to R-group diversity and denaturation.

Practice questions
1

Amino acids and the primary structureSign up

The amino acid and the peptide bond · 20 amino acids — essential vs non-essential

30 min
2

Secondary, tertiary and quaternary structure (HL)HLSign up

Secondary structure — α-helix and β-sheet (HL) · Tertiary + quaternary structure (HL)

35 min
3

Denaturation and R-group diversitySign up

pH and temperature on protein structure — denaturation · R-group diversity → conformation (HL)

25 min

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B1.1 Carbohydrates and lipids

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B2.1 Membranes and membrane transport