Question

If the sequence of nitrogen bases of the coding strand in a transcription unit is 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be:

• A. 5’ – AUGAAUG – 3’
• B. 5’ – UACUUAC – 3’
• C. 5’ – CAUUCAU – 3’
• D. 5’ – GUAAUGA – 3’

Hint:

During transcription, the RNA sequence is complementary to the DNA template strand and matches the coding strand (with U in place of T).

Answer 1

The Correct Option is A

Step 1: Relationship between the coding strand and RNA transcript. 
- The RNA transcript is complementary to the template strand and identical to the coding strand, except uracil (U) replaces thymine (T). 
Step 2: Base sequence of the transcript. - Coding strand: 5’ – ATGAATG – 3’ - mRNA transcript: 5’ – AUGAAUG – 3’