Question

Which of the following statement of a bacterial cell is/are correct?
(i) Mesosome is formed by the extensions of plasma membrane into the cell.
(ii) The pili are elongated tubular structures made up of a protein.
(iii) Flagellum is composed of filament, hook and basal body.
(iv) Ribosomes are about $30 \,nm$ by $50 \,nm$ in size.

• A. (i), (ii) and (iii)
• B. All of the above
• C. (ii) and (iv)
• D. None of the above

Answer 1

Answer: (A)

Ribosomes are about 15 nm by 20 nm in size.