Question

Read the following statements and identify the correct option(s) given.
I. A prokaryotic cell lack nuclear membrane, chloroplasts, mitochondria, microtubules and different kinds of pili.
II. In a eukaryotic cell, the nuclear membrane, chloroplast, mitochondria and pili are present.
III. In a prokaryotic cell, the ribosome is of 70S type and in mitochondria of the eukaryotic animal cell, the ribosome is of the 80S type.

• A. I is correct, II and III are incorrect
• B. I and II are correct, III is incorrect
• C. I and III are correct, II is incorrect
• D. I, II and III are incorrect

Answer 1

The correct option is D I, II and III are incorrect

Prokaryotes are generally smaller and differ from eukaryotic cells in terms of structural elements and genetic processes, e.g. bacteria, blue-green algae, mycoplasma, etc.

Unlike eukaryotes, prokaryotes lack a true nucleus and the membrane-bound organelles (mitochondrion, chloroplast, Golgi bodies, ER). However, they do possess nuclear membrane and pili projecting from the cell surface. Hence, the statement I is incorrect.

Pili are absent in eukaryotic cells, hence the statement II. is incorrect.

Ribosomes are 70S type in prokaryotes, while it is 80S in eukaryotes. However, the 70S type of ribosomes are found in mitochondria and chloroplasts of eukaryotic cells. Thus, statement III. is also incorrect.