ZIMSEC A-Level Biology
8.2.3Proteins
Proteins in ZIMSEC A-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic93 practice questions5 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 8.2.3.1Identify proteins in foods with the biuret test.
- 8.2.3.2Describe the structure of an amino acid and outline the formation and breakage of a peptide bond.
- 8.2.3.3Explain primary, secondary, tertiary and quaternary structure and the bonds that hold proteins in shape (hydrogen, ionic, disulfide, hydrophobic interactions).
- 8.2.3.4Describe the molecular structures of haemoglobin and collagen and relate them to their functions.
- 8.2.3.5Explain the mode of action of enzymes (lock and key and induced fit hypotheses).
- 8.2.3.6Follow the progress of an enzyme-catalysed reaction and explain the effects of temperature, pH, enzyme concentration and substrate concentration on its rate.
- 8.2.3.7Explain reversible and non-reversible inhibition, including heavy metals and insecticides, and the effects of competitive and non-competitive inhibitors.
Lessons
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Amino acids and the four levels of protein structure
35 min
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Enzyme inhibitors, Vmax, Km and immobilised enzymes
40 min
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Factors affecting enzyme activity
35 min
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Haemoglobin and collagen: a globular and a fibrous protein
30 min
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How enzymes work
35 min
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