A template strand of DNA is:

5' CGT AGC 3'

What is corresponding strand of mRNA?

Question

A template strand of DNA is:

5' CGT AGC 3'

What is corresponding strand of mRNA?

BlackTom AI · Accepted Answer

Let's work through the transcription logic step by step for the given template DNA strand: 5' CGT AGC 3'.

Option 1: 5’ GCU ACG 3'
This sequence uses uracil, which is correct for RNA, but the third nucleotide should be an A (paired with the template's T). The correct complementary rule yields 5' GCA UCG 3', not 5' GCU ACG 3'. The mismatch at position 3 (A vs U) makes this option incorrect.

Option 2: 5’ GCT ACG 3’
Here, there is a thymine (T) in the RNA sequence. RNA does not contain thymine; it uses uracil (U) instead. This makes the option biologically invalid for an mRNA transcript, so it is incorrect.

Option 3: 5’ CGT AGC3 ’
This is identical to the DNA template strand, not the corresponding mRNA. It also lacks the U substitution characteristic of RNA and fails to reflect the complementary pairing required during transcription. Therefore it is incorrect.

Option 4: 3’ CGU ACG 5’
This sequence is written in the opposite orientation (3' to 5' rather than the standard 5' to 3' mRNA orientation). While some of the bases resemble the complement, the orientation is inverted relative to the produced mRNA strand, and it still would include a U in the wrong position if aligned to 5' to 3', so this is not an accurate representation of the mRNA transcript.

Now, deriving the correct mRNA sequence from the template 5' CGT AGC 3' using proper base-pairing: C pairs with G, G with C, T with A (RNA uses A, not T), A with U, G with C, C with G. Reading the resulting mRNA in the 5' to 3' direction gives 5' G C A U C G 3'.

Given the options provided, none match the exact correct mRNA sequence 5' GCAUCG 3'. The closest candidate is option 1, which differs at the third base (it has U instead of A). The remaining options either use DNA bases (T) in an RNA context, misrepresent orientation, or fail to reflect the correct 5' to 3' direction.

In summary, the correct mRNA sequence is 5' GCAUCG 3', but this exact sequence is not among the listed choices; the options contain inaccuracies related to base identity (use of T in RNA, or placement of U) or orientation.

A template strand of DNA is: 5' CGT AGC 3' What is corresponding strand of mRNA?单项选择题

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