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KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
                                        Promoters and control elements work together to regulate transcription. What shows the possible locations of these in relation to a transcription start site on the DNA molecule?

    A)
    Promoters Control elements
    Downstream Distal or proximal

    B)
    Promoters Control elements
    Upstream Distal or proximal

    C)
    Promoters Control elements
    Distal or proximal Downstream

    D)
    Promoters Control elements
    Distal or proximal Upstream

    Correct Answer: B

    Solution :

    The promoter is made up of a basal promoter which is usually located within 40 base pairs from the transcription start site and an upstream promoter (proximal control element) which may be located as far as 200 base pairs from the transcription start site. Control elements can be divided into two kinds, depending on the distance from the basal promoters, proximal control elements and distal control elements. Enhancers and silencers are distal control elements.


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