12 Chemistry Unit-21 Biomolecules

25 Questions

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12 Chemistry Unit-21 Biomolecules

Prepared by: G. KUPPUSWAMY, P. G. Asst. , Pachaiyapp's HSS, Kanchipuram.   ; & www. Padasalai. Net   ; &nbs p;


Questions and Answers
  • 1. 
    Which is a mono saccharide among the following:
    • A. 

      Sucrose

    • B. 

      Cellulose

    • C. 

      Maltose

    • D. 

      Glucose

  • 2. 
    Identify the reducing sugar
    • A. 

      Sucrose

    • B. 

      Cellulose

    • C. 

      Starch

    • D. 

      Glucose

  • 3. 
    Sucrose is not
    • A. 

      A di saccharide

    • B. 

      A non-reducing sugar

    • C. 

      Hydrolysed to only glucose

    • D. 

      hydrolysed to glucose & fructose

  • 4. 
    Sucrose contains glucose and fructose linked by
    • A. 

      C1-C1

    • B. 

      C1-C2

    • C. 

      C1-C4

    • D. 

      C1-C6

  • 5. 
    Glucose is not oxidised to gluconic acid by
    • A. 

      Br2/H2O

    • B. 

      Fehling solutions

    • C. 

      Tollen's reagent

    • D. 

      Conc.HNO3

  • 6. 
    Inversion of sucrose refers to
    • A. 

      Oxidation of sucrose

    • B. 

      Reduction of sucrose

    • C. 

      Hydrolysis of sucrose to glucose and fructose

    • D. 

      Polymerisation of sucrose

  • 7. 
    Glucose forms _____________ with acetic anhydride and sodium acetate
    • A. 

      Di acetate

    • B. 

      Tetra acetate

    • C. 

      Penta acetate

    • D. 

      Hexa acetae

  • 8. 
    The amino acid without chiral carbon is
    • A. 

      Glysine

    • B. 

      Alanine

    • C. 

      Proline

    • D. 

      Thyrosine

  • 9. 
    The building block of proteins are
    • A. 

      α-hydroxy acids

    • B. 

      α-amino acids

    • C. 

      β-hydroxy acids

    • D. 

      β-amino acids

  • 10. 
    Which is not true of amino acid ?
    • A. 

      Amino acid forms Zwitter ion

    • B. 

      Has isoelectric point

    • C. 

      Dual behavious

    • D. 

      Amino acid is insoluble in NaOH solution

  • 11. 
    Two amino acids say A,B- react to give
    • A. 

      Two dipeptides

    • B. 

      Three dipeptides

    • C. 

      Four dipeptides

    • D. 

      Only one

  • 12. 
    A di peptide does not have
    • A. 

      Two dipeptide units

    • B. 

      Portions of two amino acids

    • C. 

      An amido group

    • D. 

      Sal like structure

  • 13. 
    Proteins are not sensitive to
    • A. 

      Acids

    • B. 

      Bases

    • C. 

      Elevated temperature

    • D. 

      Water

  • 14. 
    Denaturation does not involve
    • A. 

      Breaking up of H-bonding in proteins

    • B. 

      The losss of biological action of enzyme

    • C. 

      The losss of secndary structure

    • D. 

      Loss of primary structure of proteins

  • 15. 
    Specificity of enzyme is due to
    • A. 

      The sequence of amino acids

    • B. 

      Secondary structure

    • C. 

      Tertiary structure

    • D. 

      All of the above

  • 16. 
    Ultimate products of hydrolysis of proteins is
    • A. 

      Aniline

    • B. 

      Aliphatic acid

    • C. 

      Amino acid

    • D. 

      Aromatic acid

  • 17. 
    Proteins are
    • A. 

      Polypeptides

    • B. 

      Poly acids

    • C. 

      Poly phenols

    • D. 

      Poly esters

  • 18. 
    Which of the following contains a lipid ?
    • A. 

      Starch

    • B. 

      Mineral oil

    • C. 

      Edible oil

    • D. 

      Peptide

  • 19. 
    Which among the following contains triglyceride ?
    • A. 

      Wax

    • B. 

      Cooking oil

    • C. 

      Essential oil

    • D. 

      Albumin

  • 20. 
    Which contains a long chain ester ?
    • A. 

      Wax

    • B. 

      Cookingoil

    • C. 

      Turpentine oil

    • D. 

      Cellulose

  • 21. 
    An example of a fatty acid obtained from a cooking oil is
    • A. 

      Acetic acid

    • B. 

      Stearic acid

    • C. 

      Benzoic acid

    • D. 

      Oxalic acid

  • 22. 
    Which is not a saturated fatty acid ?
    • A. 

      Palmitic acid

    • B. 

      Stearic acid

    • C. 

      Oleic acid

    • D. 

      Glyceric acid

  • 23. 
    Alakaline hydrolysis ofcooking oil gives
    • A. 

      Soap

    • B. 

      Glycerol

    • C. 

      Fatty acid

    • D. 

      Both (a) and(b)

  • 24. 
    Hair and nail contains
    • A. 

      Cellulose

    • B. 

      Fat

    • C. 

      Keratin

    • D. 

      Lipid

  • 25. 
    Important constituent of cell wall is
    • A. 

      Lipid

    • B. 

      Cellulose

    • C. 

      Protein

    • D. 

      Vitamin