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Choose the correct answer from the alternatives given : If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: \( 5-A \) T \( G A A T G-3 \) the sequence of bases in its RNA transcript would be

1. 5-AUGAAUG-3
2. 5-UACUUAC-3
3. 5 сАUUсАU 3
4. 5-GUAAGUA-3.

Correct answer: 5-AUGAAUG-3

Solution

The coding strand has the same base sequence as the RNA transcript, except DNA uses thymine (T) while RNA uses uracil (U). So 5-ATGAATG-3 becomes 5-AUGAAUG-3.

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