2022 · Q37
Which of the following combinations correctly represents the genetic materials in prokaryotes and eukaryotes respectively?
general-sciencebiology-human-body
- ANucleoid and Chromatin
- BChromatin and Nucleoid
- CNucleoid and Nucleolus
- DNucleolus and Chromatin
Explanation
Prokaryotes lack a membrane-bound nucleus; their genetic material (a circular DNA molecule) lies in an irregular region of the cytoplasm called the nucleoid. Eukaryotes store their DNA as chromatin (DNA wrapped around histone proteins) inside a membrane-bound nucleus. The nucleolus (options C, D) is a sub-nuclear structure for ribosome synthesis, not the genetic material itself. Hence the correct pairing is nucleoid (prokaryotes) and chromatin (eukaryotes) — option A.