Question

Consider the following DNA template strand: ATC CAG ATG AAC AGC AAT Which is the correct complementary mRNA strand? (1 point)

Answer 1

To determine the correct complementary mRNA strand from the given DNA template strand (which is 5' to 3'), we need to transcribe it by pairing the DNA bases with their corresponding RNA bases. The base pairing rules are as follows:

- Adenine (A) pairs with Uracil (U) in RNA.
- Thymine (T) pairs with Adenine (A).
- Cytosine (C) pairs with Guanine (G).
- Guanine (G) pairs with Cytosine (C).

Given the DNA template strand:
5' - ATC CAG ATG AAC AGC AAT - 3'

The complementary mRNA strand will be synthesized in the 5' to 3' direction. Below is the transcription process:

- A (DNA) → U (RNA)
- T (DNA) → A (RNA)
- C (DNA) → G (RNA)
- C (DNA) → G (RNA)
- A (DNA) → U (RNA)
- G (DNA) → C (RNA)
- A (DNA) → U (RNA)
- T (DNA) → A (RNA)
- G (DNA) → C (RNA)
- A (DNA) → U (RNA)
- A (DNA) → U (RNA)
- C (DNA) → G (RNA)
- A (DNA) → U (RNA)
- G (DNA) → C (RNA)
- C (DNA) → G (RNA)
- A (DNA) → U (RNA)
- A (DNA) → U (RNA)
- T (DNA) → A (RNA)

Putting it all together, the mRNA strand made from the DNA template would be:

5' - UAG GUC UAC UUG UCG UUA - 3'

So, the correct complementary mRNA strand is:
**5' - UAG GUC UAC UUG UCG UUA - 3'**