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12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions With Answer Key 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 central dogma of molecular genetics states that the genetic information flows from

    (a)

    Amino acids Protein DNA

    (b)

    DNA Carbohydrates Proteins

    (c)

    DNA RNA Proteins

    (d)

    DNA RNA Carbohydrates

  2. Among the following the achiral amino acid is

    (a)

    2-ethylalanine

    (b)

    2-methylglycine

    (c)

    2-hydroxymethylserine

    (d)

    Tryptophan

  3. Which one of the following is not produced by body?

    (a)

    DNA

    (b)

    Enzymes

    (c)

    Harmones

    (d)

    Vitamins

  4. The number of sp2 and sp3 hybridised carbon in fructose are respectively

    (a)

    1and 4

    (b)

    4 and 2

    (c)

    5 and 1

    (d)

    1 and 5

  5. The pyrimidine bases present in DNA are

    (a)

    Cytosine and Adenine

    (b)

    Cytosine and Guanine

    (c)

    Cytosine and Thiamine

    (d)

    Cytosine and Uracil

  6. Complete hydrolysis of cellulose gives

    (a)

    L-Glucose

    (b)

    D-Fructose

    (c)

    D-Ribose

    (d)

    D-Glucose

  7. Which of the following statement is correct?

    (a)

    Ovalbumin is a simple food reserve in egg-white

    (b)

    Blood proteins thrombin and fibrinogen are involved in blood clotting

    (c)

    Denaturation makes protein more active

    (d)

    Insulin maintains the sugar level of in the human body

  8. Which of the following are epimers

    (a)

    D(+)-Glucose and D(+)-Galactose

    (b)

    D(+)-Glucose and D(+)-Mannose

    (c)

    Neither (a) nor (b)

    (d)

    Both (a) and (b)

  9. Which is a monosaccharide among the following?

    (a)

    Sucrose

    (b)

    Cellulose·

    (c)

    Maltose

    (d)

    Glucose

  10. The building block of proteins are

    (a)

    α - hydroxy acids

    (b)

    α-amino acids

    (c)

    β-hydroxy acids

    (d)

    β-amino acids

  11. Specificity of enzyme is due to

    (a)

    the sequence of amino acids

    (b)

    secondary structure

    (c)

    tertiary structure

    (d)

    all of the above

  12. Starch when heated with enzyme diastase yields

    (a)

    glucose

    (b)

    sucrose

    (c)

    maltose

    (d)

    glycogen

  13. Pick out the odd one.

    (a)

    Wax

    (b)

    Starch

    (c)

    Glucose

    (d)

    Fructose

  14. Sugars that yield two to ten monosaccharide molecules on hydrolysis is

    (a)

    monosaccharides

    (b)

    disaccharides

    (c)

    oligosaccharides

    (d)

    polysaccharides

  15. Fructose is not oxidised by bromine water indicates

    (a)

    the presence of aldehydic group

    (b)

    presence of ketonic group

    (c)

    absence of aldehydic group

    (d)

    absence of ketonic group

  16. 2 Marks

    10 x 2 = 20
  17. Give the differences between primary and secondary structure of proteins.

  18. Write the Zwitter ion structure of alanine

  19. Write a short note on peptide bond

  20. List the expected products of hydrolysis of lactose.

  21. What are anomers? Give example.

  22. How is fructose prepared from inulin?

  23. Why are polysaccharides called non-sugars?

  24. Why cellulose is not used as food by humans?

  25. Give the uses of cellulose.

  26. Write a note on rRNA.

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

  32. Write the product formed when HCN reacts with glucose.

  33. Complete the following reaction.
    (i) Glucose + acetic anhydride ➝ _______?_______
    (ii) What does the above reaction suggest?

  34. ExpIain the classification of proteins based on their structure.

  35. Amino acids are amphoteric in nature. Explain.

  36. Give the structure of sucrose.

  37. Write the monomers of the following sugars and explain how they are linked.
    (i) Sucrose
    (ii) Maltose
    (iii) Lactose

  38. 5 Marks

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

  40. What are different types of RNA which are found in cell

  41. Is the following sugar, D – sugar or L – sugar?

  42. Give the uses of carbohydrates.

  43. Define the following terms as related to proteins
    (i) Primary structure
    (ii) Secondary structure
    (iii) β strands

  44. List the importance of proteins in biological processes.

  45. 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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