Question

Which of the following statement(s) is/are correct?.
i) Ribosomes are called ‘protein factories’ of the cell.
ii) Ribosomes consist of three different proteins.
iii) During translation, the ribosome contains only one of the two subunits.

• A. I only
• B. II and III only
• C. III only
• D. All of the above

Answer 1

The correct option is A I only

Ribosomes are cell organelles which are involved in the synthesis of proteins and are thus known as ‘protein factories’. They are made up of a type of RNA known as ribosomal RNA (rRNA) and about 40 to 80 different proteins. The proteins present in ribosomes act as structural scaffolding.

It has two subunits - large and small. When the ribosome is not synthesising proteins, the two subunits may be present separately. During the process of protein synthesis the two subunits come together.