Question

Which of the following subunits of ribosomes is composed of 23S rRNA and 5S rRNA along with 32 different proteins?
(A) 50S
(B) 70S
(C) 30S
(D) 60S
(E) 40S

Answer 1

Hint: Ribosomes are very important organelles for biological protein synthesis inside living cells and are made of two distinct but unequal subunits which are farther made of rRNA and certain proteins.

Complete answer:
The 50S ribosomal subunit has 23S rRNA and a 5s rRNA with 32 different proteins. Along with the 30S subunit, the 50S Ribosome consists of the 70S type of ribosome present in prokaryotic cells as well as mitochondria and chloroplast of the eukaryotic cells.

Additional Information: The organelles found within all living organisms that perform protein synthesis by linking amino acids in a specific order are known as ribosomes. These consist of two major subunits- one small and one large subunit, each consists of one or more rRNA and mang ribosomal proteins (RPs or r-proteins). As the ribosomes are made of complexes of RNAs and proteins therefore they are known as ribonucleoprotein complexes.
Prokaryotic ribosomes consist of two subunits namely 50S and 30S where 50S has 23S rRNA and 5S rRNA and 31 RPs and 30S subunits have 30S rRNA and 21 RPs. In the case of eukaryotic ribosomes, the subunits are the 60S and 40S. The 60S subunit contains 28S, 5.8S, and 5S rRNA and 49RPs whereas the 40S subunit contains 18S rRNA and 33 r-proteins.

Note: Ribosomes are very small particles scattered in the cytoplasm of living cells and are associated with biological protein synthesis. These proteins are essential for cellular activities like chemical or healing processes. Ribosomes are sometimes found attached to the endoplasmic reticulum and that type of endoplasmic reticulum is known as RER. The Ribosomes convert genetic code into amino acid sequences and build protein from amino acid monomers.