Which unicellular cell type lacks a nucleus and membrane-bound organelles but has ribosomes?

Which unicellular cell type lacks a nucleus and membrane-bound organelles but has ribosomes?

• A. Prokaryote
• B. Eukaryote
• C. Virus
• D. Fungus

Answer: (A)

Prokaryotes are the kind of unicellular cells that do not have a nucleus or membrane-bound organelles, yet they do have ribosomes to make proteins. Their genetic material sits in a nucleoid region, not inside a true nucleus, and they lack the internal compartments that characterize eukaryotic cells. This simple organization—no nucleus, no membrane-bound organelles, but ribosomes present—is the hallmark of prokaryotes, which include bacteria and archaea. In contrast, eukaryotes have a nucleus and various organelles, even when they are single-celled, and fungi are examples of unicellular eukaryotes. Viruses aren’t cells at all and don’t carry out protein synthesis with their own ribosomes.

Prokaryotes are the kind of unicellular cells that do not have a nucleus or membrane-bound organelles, yet they do have ribosomes to make proteins. Their genetic material sits in a nucleoid region, not inside a true nucleus, and they lack the internal compartments that characterize eukaryotic cells. This simple organization—no nucleus, no membrane-bound organelles, but ribosomes present—is the hallmark of prokaryotes, which include bacteria and archaea. In contrast, eukaryotes have a nucleus and various organelles, even when they are single-celled, and fungi are examples of unicellular eukaryotes. Viruses aren’t cells at all and don’t carry out protein synthesis with their own ribosomes.