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In a transcription unit, the strand that has the polarity 3' to 5' and is used by RNA polymerase to direct RNA synthesis is called the:
A{'text': 'Coding strand', 'label': 'A'}
B{'text': 'Template strand', 'label': 'B'}
C{'text': 'Sense strand', 'label': 'C'}
D{'text': 'Antisense promoter', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Template strand', 'label': 'B'}
RNA polymerase synthesises 5' to 3', so the strand read must be 3' to 5'. This is the template (antisense) strand. The complementary 5' to 3' strand, identical to RNA except T for U, is the coding (sense) strand.
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