Answer:
To determine the DNA strand from which the mRNA strand was transcribed, we need to use the process of transcription and understand the base pairing rules between DNA and RNA.
During transcription, mRNA is synthesized from a DNA template. The base pairing rules between DNA and RNA are as follows:
- Adenine (A) pairs with Uracil (U) in RNA instead of Thymine (T) as in DNA.
- Guanine (G) pairs with Cytosine (C) in both DNA and RNA.
Given the mRNA sequence AUGACCUGU, we can determine the DNA sequence that it was transcribed from by replacing each Uracil (U) in the mRNA with Thymine (T) and reversing the sequence, following the complementary base pairing rules:
mRNA: AUGACCUGU
↓ ↓ ↓ ↓ ↓
TACUGGACA
Thus, the DNA sequence that the mRNA strand was transcribed from is TACUGGACA.
