Question

A DNA template strand has the following sequence: 5'-TACGGGATT-3'. What is the mRNA sequence transcribed from the DNA?

1) 3'-AAUCAGUTA-5'
2) 3'-UACGGGAUU-5'
3) 3'-AUGCCCUAA-5'
4) 3'-ATGCCCTAA-5'
5) 3'- TACGGGATT-5'

Answer 1

Transcription involves creating an mRNA sequence that is complementary to the DNA template strand. Given the DNA template 5'-TACGGGATT-3', the transcribed mRNA sequence is 5'-AUGCCCUAA-3', which matches option 3 from the provided choices.

Step-by-step explanation:

The question pertains to the process of transcription, which is when the enzyme RNA polymerase transcribes the nucleotide sequence of a DNA template strand into a complementary mRNA strand. In this process, adenine (A) in the DNA pairs with uracil (U) in the mRNA, thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) with cytosine (C).

Given the DNA template strand 5'-TACGGGATT-3', the transcribed mRNA sequence would be complementary to it. This means:

• For the DNA base adenine (A) use uracil (U) in mRNA
• For the DNA base cytosine (C) use guanine (G) in mRNA
• For the DNA base guanine (G) use cytosine (C) in mRNA
• For the DNA base thymine (T) use adenine (A) in mRNA

So, the corresponding mRNA sequence would be 5'-AUGCCCUAA-3'. Option 3 in the provided question is the correct mRNA sequence.