Question

Which of the following are ribosomes which function in clusters?

• A. Histones
• B. Nucleoli
• C. Endoplasmic reticulum
• D. The Golgi complex
• E. Polysomes

Answer 1

The correct option is E Polysomes

(A) Histones are basically alkaline protein molecules with octagonal core responsible for packaging of DNA strands around them so as to condense them into chromatin fibers and stay as nucleosome within a eukaryotic cell.

(B) Nucleoli (Nucleolus singular) is the site of biogenesis for ribosomes and other signal recognition particles. It is located within the nucleus and plays part in cell division and stress response mechanisms.

(C) Endoplasmic reticulum is a membranous tubular structure existing in continuation with the nuclear membrane in eukaryotic cells. They are sites for protein and lipid synthesis. They host a numerous ribosomes on their surface but are not directly involved in their functioning.

(D) Golgi complex is the organelle responsible for enzymatic reactions within the cell.

(E) Polysomes is a collective term for cluster of ribosomes which are present on the surface of Endoplasmic reticulum. Polysome can be considered as a complex MRNA molecule consisting of multiple ribosomal sub-unite and responsible for polypeptide production via translation.

Hence, (E) Polysomes is the correct answer