Botany - Biomolecules Book Back Questions

11th Standard

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Biology

Time : 00:45:00 Hrs
Total Marks : 28
    4 x 1 = 4
  1. The most basic amino acid is

    (a)

    Arginine

    (b)

    Histidine

    (c)

    Glycine

    (d)

    Glutamine

  2. An example of feedback inhibition is

    (a)

    Cyanide action on cytochrome

    (b)

    Sulpha drug on folic acid synthesiser bacteria

    (c)

    Allosteric inhibition of hexokinase by glucose - 6 - phosphate

    (d)

    The inhibition of succinic dehydrogenase by malonate

  3. Enzymes that catalyse interconversion of optical, geometrical or positional isomers are

    (a)

    Ligases

    (b)

    Lyases

    (c)

    Hydrolases

    (d)

    Isomerases

  4. Proteins perform many physiological functions. For example some functions as enzymes. One of the following represents an additional function that some proteins discharge:

    (a)

    Antibiotics

    (b)

    Pigment conferring colour to skin

    (c)

    Pigments making colours of flowers

    (d)

    Hormones

  5. 2 x 2 = 4
  6. Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown & one blank component" X" in it.

    CATEGORY COMPOUND
    Cholesterol Guanine
    Amino acid NH2
    Nucleotide Adenine
    Nucleoside Uracil
  7. Distinguish between nitrogenous base and a base found in inorganic chemistry.

  8. 4 x 5 = 20
  9. What are the factors affecting the rate of enzyme reaction?

  10. Briefly outline the classification of enzymes.

  11. Write the characteristic features of DNA.

  12. Explain the structure and functions of different types of RNA.

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