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[O] Pure Biology Smart Guides
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I. PRINCIPLES OF BIOLOGY
2. Cells2 Topics -
3. Movement of Substances1 Topic
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4. Nutrients4 Topics
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5. Enzymes2 Topics
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II. MAINTENANCE AND REGULATION OF LIFE PROCESSES6. Nutrition in Humans4 Topics
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7. Nutrition in Plants2 Topics
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8. Transport in Humans5 Topics
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9. Transport in Plants4 Topics
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10. Respiration in Humans5 Topics
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11. Excretion in Humans4 Topics
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12. Homeostasis3 Topics
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13. Nervous System2 Topics
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14. Human Eye2 Topics
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15. Hormones2 Topics
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III. CONTINUITY OF LIFE16. Cell Division3 Topics
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17. Reproduction in Plants3 Topics
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18. Reproduction in Humans5 Topics
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19. Heredity6 Topics
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20. Molecular Genetics2 Topics
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IV. MAN AND HIS ENVIRONMENT21. Ecology5 Topics
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22. Our Impact on the Ecosystem2 Topics
Chapter 3,
Topic 2
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Protein
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Protein[CHON(S)]
Amino acids, the building blocks of proteins, are made up of:
- an amino group
- an acid group
- a side chain
What are proteins?
Amino acids are the building blocks of proteins.Peptide bonds link up aminoacids to form a polypeptide.Two or more polypeptide chains fold to form a 3-Dmolecule, called protein.
Biuret test(proteins)
- Add 2 cm3 of sodium hydroxide solution to2 cm3 of food sample into a test tube.
- Shake the mixture thoroughly.
- Add 1% copper(II) sulfate solution dropwise,shaking the mixture after each drop.
| Proteins are needed for: – the synthesis of new protoplasm for growth and repair of worn-out cells – the synthesis of enzymes and some hormones – the synthesis of antibodies to combat diseases |
