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The transfer of genetic information from DNA to RNA is known as transcription. During this process, only one strand of DNA is used as a template for RNA synthesis. The DNA strand with a 3' → 5' orientation serves as the template strand, while the strand with a 5' → 3' orientation is referred to as the coding strand.

1. (a)
2. (b)
3. (c)
4. (d)

Correct answer: (a)

Solution

During transcription, RNA polymerase reads the DNA template strand in the 3'→5' direction so it can build RNA 5'→3'. The coding strand is not used as the template because it has the same sequence as the RNA except T is replaced by U.

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