Question

80S ribosomes have two sub units which are:

• A. 20S and 60S
• B. 30S and 50S
• C. 40S and 60S
• D. 40S and 40S

Answer 1

The Correct Option is C

80S ribosomes of eukaryotic cell are made up of two 60S and 40S subunits.

Answer 2

Explanation: 

• Ribosomes are made up of rRNA or ribosomal RNA and protein.
• There are two types of ribosomes that are divided based on the S-value or Svedburg unit:

1. The 70S ribosome which is found in prokaryotic organisms like bacteria, blue-green algae, etc
2. The 80S ribosome which found in eukaryotic organisms

• The ribosomes consist of two subunits (smaller subunit and a larger subunit) composed of long RNA strands.
• The 70S ribosome split into densities 50S (larger subunit) and 30S (smaller sub-units). During protein synthesis these two subunits combine together to complete the 70S ribosome.
• Similarly, 80S ribosomes split into 60S and 40S subunits. These units also combine together to form 80S ribosomes during protein synthesis.