Question

Below is a picture of a section of DNA undergoing transcription. The question marks represent the sequence of mRNA that will be transcribed from the DNA. What will the sequence of mRNA be?

Answer 1

tac tag agc att

Answer 2

To determine the sequence of mRNA transcribed from a DNA sequence, we follow these general rules:

1. Adenine (A) in DNA pairs with Uracil (U) in RNA (instead of Thymine).
2. Thymine (T) in DNA pairs with Adenine (A) in RNA.
3. Cytosine (C) in DNA pairs with Guanine (G) in RNA.
4. Guanine (G) in DNA pairs with Cytosine (C) in RNA.

If you can provide the specific DNA sequence from which the mRNA will be transcribed, I can help you determine the corresponding mRNA sequence. Please share the DNA sequence in question.

Answer 3

To transcribe the given DNA sequence \( \text{tac tag agc att} \) into mRNA, we will replace each DNA nucleotide with its corresponding RNA nucleotide according to the base pairing rules:

- A (adenine) in DNA pairs with U (uracil) in RNA.
- T (thymine) in DNA pairs with A (adenine) in RNA.
- C (cytosine) in DNA pairs with G (guanine) in RNA.
- G (guanine) in DNA pairs with C (cytosine) in RNA.

Now, let's transcribe the sequence:

1. t → A
2. a → U
3. c → G
4. t → A
5. a → U
6. g → C
7. a → U
8. g → C
9. c → G
10. a → U
11. t → A
12. t → A

Putting this all together, the mRNA sequence transcribed from the DNA sequence \( \text{tac tag agc att} \) is:

**mRNA Sequence:** **AUG AUC UCG UAA**

(Note: In mRNA transcription, we read the DNA sequence from the 5' to 3' direction, so the mRNA is also synthesized in the 5' to 3' direction.)