Question

Cyanobacteria are photosynthetic prokaryotes. Which of the following cell structures are absent in cyanobacteria?

I. Cell membrane
II. Nucleus
III. Ribosomes

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. I and III only

Answer 1

The correct option is B II only

Cyanobacteria are prokaryotes so, they lack a membrane-bound well-defined nucleus. Cell membrane and ribosomes are the cell structures, common to both prokaryotes and eukaryotes.

Therefore, the correct answer is option B.