Which of the following must occur before mRNA can leave the nucleus in a eukaryotic cell?
I. Introns are removed.
II. Exons are spliced together.
III. Exons are removed.
IV. Introns are spliced together.
V. A poly-A tail is added to the mRNA.
VI. A 5' cap sequence is removed from the mRNA.
A. III, IV, and V
B. I, II, and VI
C. III, IV, and VI
D. I, II, and V
Answer (2)
Before mRNA can leave the nucleus in eukaryotic cells, introns must be removed, exons spliced together, and a poly-A tail added. These modifications ensure the mRNA is functional and stable. The correct answer to the question is D. I, II, and V. ;
Before mRNA can leave the nucleus in eukaryotic cells, introns must be removed, exons spliced together, and a poly-A tail added. These modifications are essential for the stability and functionality of mRNA. The correct option is D. I, II, and V.
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