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The enzyme DNA dependent RNA polymeras...

The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ________ direction .

A

only `5' to 3'`

B

only `3' to 5'`

C

Both (a) and (b)

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
(a) : The two strands have opposite polarity and the DNA-dependent RNA polymerase also catalyse the polymerisation in only one direction, that is , `5' rarr 3'` the strand that has the sequence same as RNA (except thymine at the place of uracil ) is displaced during transcription. This strand (which does not code for anything ) is referred to as coding strand.
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Knowledge Check

  • RNA polymerase I catalyses :

    A
    t-RNA synthesis
    B
    r-RNA synthesis
    C
    m-RNA synthesis
    D
    initiation in transcription

  • The DNA dependent DNA polymerase catalyse polymerisation in -

    A
    `3' to 5'` direction
    B
    `5' to 3'` direction
    C
    Depend on the nature of template strand
    D
    Both (1) & (2)

  • The DNA dependent DNA polymerase catalyze polymerisation in

    A
    3'`to`5' direction
    B
    5' `to` 3' direction
    C
    Depend on the nature of template strand
    D
    Both (a) & (b)

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    Enzyme DNA dependent RNA polymerase is used in

    DNA polymerase III catalyses :

    RNA polymerase I catalyses synthesis of

    The replication process involves the following steps: (I) The enzyme DNA-dependent DNA poly merases catalyse the polymerisation of DNA strand. (II) The lagging strand is synthesized in frag ments known as Okazaki fragments, which are later joined by the enzyme DNA Ligase. (III) The origin of replication serves as the recognition site for DNA polymerase and also it provides the site for attachment of RNA primer. (IV)The structural gene coding for a partic ular protein is flanked by the promoter and terminator. Choose the correct option:

    How many of the following is/are correct statement? (A)In capping an unusual nucleotides is added to the 3' end of hn RNA (B)In tailing adenylated residues are added at 3' end in a template independent manner. (C)The untranslated regions (UTR) are required for efficient DNA replication process. (D)The DNA-dependent DNA polymerases catalyse polymerisation only in one direction that is 5' to 3'.

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