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Biomolecules Model Question Paper

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    10 x 1 = 10
  1. Which one given below is a non-reducing sugar?

    (a)

    Glucose

    (b)

    Sucrose

    (c)

    maltose

    (d)

    Lactose

  2. The pyrimidine bases present in DNA are

    (a)

    Cytosine and Adenine

    (b)

    Cytosine and Guanine

    (c)

    Cytosine and Thiamine

    (d)

    Cytosine and Uracil

  3. Among the following L-serine is

    (a)

    (b)

    (c)

    (d)

  4. Name the base present only in RNA

    (a)

    adenine

    (b)

    guanine

    (c)

    uracil

    (d)

    thymine

  5. The amino acid without chiral carbon is

    (a)

    Glycine

    (b)

    Alanine

    (c)

    Proline

    (d)

    Tyrosine

  6. Identify the monosaccharide among the following

    (a)

    glucose

    (b)

    fructose

    (c)

    galactose

    (d)

    all the above

  7. Lactose on hydrolysis gives

    (a)

    two molecules of glucose

    (b)

    glucose and fructose

    (c)

    two molecules of fructose

    (d)

    glucose and galactose

  8. The number of optical isomers are calculated by____________

    (a)

    2n+2

    (b)

    2n-2

    (c)

    2n

    (d)

    2n/2

  9. Oxidation of gluconic acid with nitric acid gives__________

    (a)

    saccharicacid

    (b)

    CO2 and water

    (c)

    acetic acid

    (d)

    maltose

  10. The helical structure of protein is stabilised by_________

    (a)

    peptide bonds

    (b)

    disulphide bonds

    (c)

    hydrogen bonds

    (d)

    Vanderwaals inter action

  11. 1 x 1 = 1
  12. Which among the following is correct regarding nucleic acids?
    a) Hydrolysis of DNA and RNA gives two components, a pentose sugar and phosphate group 
    b) Both DNA and RNA have thymine as one of : 5. the pyrimidines :
    c) The two major purine bases of both RNA and DNA are adenine and guanine.
    d) The pyrimidine base present only in DNA is uracil.

    ()

    The two major purine bases of both RNA and DNA are adenine and guanine.

  13. 1 x 2 = 2
  14. Assertion: Vitamin D can be stored in our body.
    Reason : Vitamin D is a fat soluble vitamin
    a) (A) and (R) are true and (R) is the correct explanation of (A)
    b) Both (A) and (R) are true but (R) does not explain (A)
    c) (A) is true but (R) is false
    d) Both (A) and (R) are false

  15. 1 x 2 = 2
  16. Select the incorrect statement among the following
    a) Hemoglobin is soluble in water
    b) α - Kelatin is soluble in water
    c) Cellulose is a polymer of glucose
    d) Chlorophyll is responsible for the synthesis of carbohydrates in plants

  17. 3 x 2 = 6
  18. Identify whether the following compounds are D or L isomers.

  19. Why is glucose known as dextrose?

  20. The sucrose that we eat in daily life is converted into glucose and fructose. Name the enzyme which facilitates this chemical reaction.

  21. 3 x 3 = 9
  22. How are vitamins classified

  23. Write a reaction that indicates the presence of an aldehyde group in glucose.

  24. What is starch? What are the ultimate hydrolysis products?

  25. 2 x 5 = 10
  26. Is the following sugar, D – sugar or L – sugar?

  27. Show the formation of a peptide bond with an equation. (OR) What is a peptide bond? Illustrate the formation of a peptide bond in glycin alanine.

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