Question

Ribosomal RNA is actively synthesized in
A. Lysosomes
B. Nucleolus
C. Nucleoplasm
D. Ribosomes.

Answer 1

Hint:-rRNA is also known as Ribosomal RNA. It is a ribonucleic acid enzyme that can catalyze several biochemical reactions like the splicing of RNA. rRNA is considered as the primary material of the ribosomes. Ribosomal DNA synthesizes the rRNA which takes part in the synthesis of proteins.

Complete Answer:-Lysosomes are membrane-enclosed cellular organelle that is found in eukaryotic cells. It is responsible for carrying and storing the digestive enzymes which are used to protect the cell from bacteria and viruses. The enzymes which are found in the lysosomes are called hydrolytic enzymes that are capable of breaking down the larger particles into small components.
The eukaryotic cell comprises a membrane-bound nucleus which involves a certain structure called the nucleolus. It is considered the largest part of the eukaryotic nucleus. Four major components are found in the nucleolus. These are FC or fibrillar center, amorphous, GC or granular component, and chromatin. It is a roughly rounded structure. At the nucleolar organizing region it attaches with the chromatin. The nucleolus is the site of eukaryotic cells where rRNAs are actively synthesized. Thus nucleolus is considered as the ribosomal factory.
The cytoplasm-like structure, found in the eukaryotic nucleus that is enclosed by a nuclear envelope called nucleoplasm or karyoplasm. It is responsible for supporting the nucleolus and chromosome into the nucleolus and acts as the suspension medium.
Ribosomes are one of the important organelles found in both prokaryotic cells and eukaryotic cells. Ribosomes are made up of ribosomal proteins and ribosomal RNAs. Ribosomes function as the protein-synthesizing machine.

Hence, the correct answer is option B. Nucleolus

Note:- Though Ribosomal RNAs are synthesized into the nucleolus of the nucleus, the Ribosomal proteins are synthesized within the cytoplasm of the cell. Ribosomal RNA and ribosomal proteins form the ribosomes associating with each other. Ribosomes are responsible for producing the proteins by attaching the amino acids.