Question

______ protein binds ______ in mRNA and interacts with the nuclear export receptor and allows for export of the intact, unprocessed, full length mRNA.

A) Poly(A) binding protein, poly(A) tail
B) Cap-binding complex, 5' cap
C) Spliceosome, introns
D) SR proteins, exons

Answer 1

The Cap-binding complex binds to the 5' cap in mRNA, interacting with the nuclear export receptor to allow mRNA export to the cytoplasm. It is essential for mRNA stability and translation initiation.

Step-by-step explanation:

The protein that binds to the 5' cap in mRNA and interacts with the nuclear export receptor, allowing for the export of the intact, unprocessed, full-length mRNA, is the Cap-binding complex. This complex facilitates the exit of mRNAs from the nucleus into the cytoplasm. The 5' methylguanosine cap and the poly(A) tail are crucial for the protection of mRNA from degradation and for its transportation through nuclear pores into the cytoplasm. After reaching the cytoplasm, specific factors recognize the cap to initiate translation by ribosomes.