MICROANATOMY

Detailed explanation-1: -Some chromosomes have sections of DNA that encode ribosomal RNA, a type of structural RNA that combines with proteins to make the ribosome. In the nucleolus, new ribosomal RNA combines with proteins to form the subunits of the ribosome.

Detailed explanation-2: -Transfer RNA (tRNA) brings the protein building blocks, amino acids, to the ribosome.

Detailed explanation-3: -Ribosomal genes and RNA are transcribed in small regions of the nucleolus known as the ‘fibrillar center (FC)’ and ‘dense fibrillar component (DFC)’. The bulk of the nucleolus is the granular component (GC), where rRNA and proteins assemble to the ribosomal subunit (Figure 4).