Eukaryotic ribosomes leave the nucleus as
A) intact 80S ribosomes.
B) intact 70S ribosomes.
C) 40S and 60S ribosomal subunits.
D) 18S and 28S rRNAs.

Question

Quizplus · Accepted Answer

Eukaryotic ribosomes are composed of four rRNAs and about 80 different proteins. They are made up of two subunits, a small 40S subunit and a large 60S subunit, which come together to form the functional 80S ribosome. During biogenesis, these two subunits are synthesized separately in the nucleolus and then transported out of the nucleus separately. Therefore, eukaryotic ribosomes leave the nucleus as 40S and 60S ribosomal subunits.

Eukaryotic Ribosomes Leave the Nucleus as