Given diagram represents the schematic structure of a transcription unit with some parts labelled as A, B, C and D. Select the option which shows its correct labelling.

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A → Terminator; B → Promoter; C → Template strand; D → Coding strand

A → Promoter; B → Terminator; C → Coding strand; D → emplate strand

A → Promoter; B → Terminator; C → Template strand; D → Coding strand

A → Terminator; B → Promoter; C → Coding strand; D → emplate strand

answer is C.

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Detailed Solution

Promotor is located towards 5' end with respect to coding strand . It provides binding site for attachment of RNA polymerase. Terminator is situated towards 3'end with respect to coding strand .The polarity 3'__5' acts as a template, and is also referred to as template strand. The other strand which has the polarity (5'__3') and the sequence same as RNA (except thymine at the place of uracil), is displaced during transcription. This strand (which has base sequence similar to mRNA except in T and U) is referred to as coding strand.

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