How many different proteins does the ribosome consist of?
Answer: (A) 80. Answer: (A) 80 Solution: A ribosome is a ribonucleoprotein particle made of rRNA and proteins.
- A.80✓
- B.60
- C.40
- D.20
Correct Answer
(A) 80
Solution & Explanation
Answer: (A) 80 Solution: A ribosome is a ribonucleoprotein particle made of rRNA and proteins. The eukaryotic 80S ribosome is built from roughly 80 different protein molecules (along with its rRNAs) distributed across its 60S and 40S subunits. This precise protein count is an extension beyond NCERT, which states only that ribosomes are composed of RNA and proteins and that the 80S ribosome consists of 60S and 40S subunits. NCERT Reference: Ch 8, p.98, lines 31–36: "They are composed of ribonucleic acid (RNA) and proteins and are not surrounded by any membrane. The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S. Each ribosome has two subunits, larger and smaller subunits".