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12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions 2021

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. The correct corresponding order of names of four aldoses with configuration given below Respectively is,

    (a)

    L-Erythrose, L-Threose, L-Erythrose, D-Threose

    (b)

    D-Threose,D-Erythrose, L-Threose, L-Erythrose,

    (c)

    L-Erythrose, L-Threose, D-Erythrose, D-Threose

    (d)

    D-Erythrose, D-Threose, L-Erythrose, L-Threose

  2. In a protein, various amino acids linked together by

    (a)

    Peptide bond

    (b)

    Dative bond

    (c)

    \(\alpha\)-Glycosidic bond

    (d)

    \(\beta\) - Glycosidic bond

  3. In aqueous solution of amino acids mostly exists in,

    (a)

    NH2-CH(R)-COOH

    (b)

    NH2-CH(R)-COO-

    (c)

    H3N+-CH(R)-COOH

    (d)

    H3N+-CH(R)-COO-

  4. The secondary structure of a protein refers to

    (a)

    fixed configuration of the polypeptide backbone

    (b)

    hydrophobic interaction

    (c)

    sequence of α-amino acids

    (d)

    \(\alpha-\)helical backbone.

  5. Complete hydrolysis of cellulose gives

    (a)

    L-Glucose

    (b)

    D-Fructose

    (c)

    D-Ribose

    (d)

    D-Glucose

  6. Glucose is an aldose. Which one of the following reactions is not expected with glucose?

    (a)

    It does not form oxime

    (b)

    It does not react with Grignard reagent

    (c)

    It does not form osazones

    (d)

    It does not reduce tollens reagent

  7. If one strand of the DNA has the sequence ‘ATGCTTGA’, then the sequence of complementary strand would be

    (a)

    TACGAACT

    (b)

    TCCGAACT

    (c)

    TACGTACT

    (d)

    TACGRAGT

  8. Name the base present only in RNA

    (a)

    adenine

    (b)

    guanine

    (c)

    uracil

    (d)

    thymine

  9. Identify the reducing sugar.

    (a)

    Sucrose

    (b)

    Cellulose

    (c)

    Starch

    (d)

    Glucose

  10. 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

  11. Denaturation does not involve

    (a)

    breaking up ofH-bonding in proteins

    (b)

    the loss of biological action of enzyme

    (c)

    the loss of secondary structure

    (d)

    loss of primary structure of proteins

  12. Which among the following contains triglyceride?

    (a)

    Wax

    (b)

    Cooking oil

    (c)

    Essential oil

    (d)

    Albumin

  13. The ultimate product of hydrolysis of starch in the presence of dilute acid is

    (a)

    dextrin

    (b)

    maltose

    (c)

    maltase

    (d)

    glucose

  14. Glucose+aceticanhydrid \(\overset { pyridine }{ \longrightarrow } ?\)

    (a)

    di acetate

    (b)

    tetra acetate

    (c)

    penta acetate

    (d)

    hexa acetate

  15. Which among the following bases in not found in RNA?

    (a)

    cytosine

    (b)

    guanine

    (c)

    uracil

    (d)

    thymine

  16. 2 Marks

    10 x 2 = 20
  17. What type of linkages hold together monomers of DNA?

  18. Name the Vitamins whose deficiency cause
    i) rickets
    ii) scurvy

  19. Write a short note on peptide bond

  20. A sugar contains 4 carbon atoms and the functional group is -CHO group. Identify the type of sugar and give an example for it.

  21. What is epimerisation?

  22. What is meant by blood sugar?

  23. Distinguish between fibrous and globular proteins.

  24. How are lipids classified?

  25. Name the vitamin responsible for coagulation of blood.

  26. Distinguish between nucleosides and nucleotides.

  27. 3 Marks

    10 x 3 = 30
  28. Give two difference between Hormones and vitamins

  29. What are reducing and non – reducing sugars?

  30. Classify the following into monosaccharides, oligosaccharides and polysaccharides.
    i) Starch
    ii) fructose
    iii) sucrose
    iv) lactose
    iv) maltose

  31. How are vitamins classified

  32. Explain the reaction which indicates the presence of ketonic group in fructose.

  33. Justify the presence of keto group in C2 in fructose.

  34. Distinguish between fat soluble and water soluble vitamins.

  35. How do enzymes help a substrate to be attacked by the reagent effectively?

  36. Give the structure of sucrose.

  37. Write note on oligosaccharides and polysaccharides with examples.

  38. 5 Marks

    7 x 5 = 35
  39. Write the structure of all possible dipeptides which can be obtained form glycine and alanine

  40. Write a note on formation of α-helix .

  41. Give the uses of carbohydrates.

  42. Elucidate the structure of fructose.

  43. List the importance of proteins in biological processes.

  44. Outline the classification of carbohydrates giving example for each.

  45. Distinguish glucose from fructose.

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