The structure of $DNA$ is
  • A
    Linear
  • B
    Single helix
  • C
    Double helix
  • D
    Triple helix
Easy
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    Match items of Row $I$ with those of Row $II$.

    Row $I-Image$

    Row $II:$

    $(i)$ $\alpha- D -(-)$ Fructofuranose.

    $(ii)$ $\beta$-D-(-) Fructofuranose

    $(iii)$ $\alpha$-D-(-) Glucopyranose.

    $(iv)$ $\beta- D -(-)$ Glucopyranose

    Correct match is

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  • 2
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  • 3
    Which amino acid does not contain chiral centre
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  • 4
    Which of the following statement is not correct?
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  • 5
    Which of the following statement($s$) is(are) true ?

    $(1)$ Oxidation of glucose with bromine water gives glutamic acid

    $(2)$ The two six-membered cyclic hemiacetal forms of $D-(+)$-glucose ard called anomers

    $(3)$ Hydrolysis of sucrose gives dextrorotatory glucose and laevorotatory fructose

    $(4)$ Monosaccharides cannot be hydrolysed to give polyhydroxy aldehydes and ketones

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  • 6
    The number of atoms in the cyclic structure of $D-$ fructose is
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  • 7
    $\begin{matrix}
       O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
       ||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
       N{{H}_{2}}-CH-C-NH-C{{H}_{2}}-C{{O}_{2}}H  \\
       |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
       C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
    \end{matrix}$

    Identify the amino acid obtained by hydrolysis of the above compound

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  • 8
    Fructose on reduction gives a mixture of two alcohols which are related as
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  • 9
    Assertion : Vitamin $D$ cannot be stored in our body
    Reason : Vitamin $D$ is fat soluble vitamin and is excreted from the body in urine.
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  • 10
    The segment of $DNA$ which acts as the instructional manual for the synthesis of the protein is
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