Question

what is true about mrna during transcription? mrna is not in transcription. dna sequence is copied into mrna molecules. mrna disappears slowly from the cell.

Explanation:

To determine the correct answer, we analyze each option:

1. The first option ("mRNA is not in transcription") is incorrect because transcription is the process of synthesizing mRNA from DNA.
2. The second option ("DNA sequences are copied into mRNA molecules") is correct. Transcription involves the enzyme RNA polymerase copying the DNA sequence (specifically the coding strand) into a complementary mRNA molecule in the nucleus.
3. The third option ("mRNA disappears slowly from the cell") describes mRNA degradation, which occurs after translation, not during transcription.

Answer:

B. DNA sequences are copied into mRNA molecules (assuming the middle option is labeled B; if the options are unlabeled, the correct one is the middle option stating "DNA sequences are copied into mRNA molecules")