Which of the following is NOT true?
Which of the following is NOT true?
Select an option to attempt
Correct Answer: Option B
Explanation
Prokaryotes (Bacteria and Archaea) appeared approximately 3.5 billion years ago, while eukaryotes evolved much later (~1.5–2 billion years ago). The endosymbiotic theory proposes that mitochondria and chloroplasts arose from prokaryotic ancestors engulfed by a proto-eukaryotic cell. Therefore, saying 'eukaryotic cells are evolutionarily more ancient than prokaryotic cells' is FALSE. All other statements — prokaryotes are unicellular, prokaryotes lack a membrane-bound nucleus, and eukaryotes can be unicellular (e.g., yeast, Amoeba) or multicellular — are TRUE.