Question

Ribosomes are produced in
A. Nucleolus
B. Cytoplasm
C. Mitochondria
D. Golgi body

Answer 1

Ribosomes are granular molecular machines containing two major subunits that help in protein synthesis. It is found in all living cells. Ribosomes were found by George Emil Palade in 1955, hence ribosomes are also called Palade granules. Ribosomes are found in both eukaryotic and prokaryotic organisms. Ribosomes are highly complex structures whose main function is to synthesize proteins.

Complete answer:
Nucleolus is a darkly stained region present inside the nucleus (eukaryotes) and nucleoid (prokaryotes) which actively synthesize the ribosomal particles. A Ribosome is made from RNA and protein complexes. Each Ribosome in prokaryotes composed of a small (30s) and a large (50s) subunit, where 30s functions in decoding and 50s has a catalytic function and in eukaryotes ribosome is composed of a small (40s) and a large (60s) where ‘s’ denotes sedimentation coefficient. Ribosomes are non membranous in nature and each subunit consists of one or more ribosomal protein. The Golgi body helps in the formation of lysosome, mitochondria helps in production of ATP whereas cytoplasm Eukaryotic ribosomes are produced and assembled in the Nucleolus. Ribosomal proteins enter the Nucleolus and combine with rRNA strands to form ribosomes. Nucleolus synthesizes and stores RNA.

Hence, the correct answer is option (A).

Note: Ribosomes consist of RNA and protein, where RNA is specified as rRNA (Ribosomal RNA). They serve as a site of protein synthesis in the cell, they can be found as floating within the cytoplasm or attached with the endoplasmic reticulum (Rough endoplasmic reticulum). Ribosomes are generally found in all living organisms whose main functions are to synthesize proteins.