EVERYDAY SCIENCE

Detailed explanation-1: -What does the nucleolus contain? The nucleolus contains DNA, RNA and proteins. It is a ribosome factory. Cells from other species often have multiple nucleoli.

Detailed explanation-2: -The nucleolus is a ribosome factory, composed of deoxyribonucleic acid (DNA), ribonucleic acid (RNA), and protein.

Detailed explanation-3: -The many proteins that function in the nucleus-including histones, DNA and RNA polymerases, gene regulatory proteins, and RNA-processing proteins-are selectively imported into the nuclear compartment from the cytosol, where they are made.

Detailed explanation-4: -In the 1960s, it was settled that the nucleolus houses both DNA and RNA, the latter of which being transcribed there (Fakan and Bernhard 1971; Granboulan and Granboulan 1964, 1965).