Which of the following is a correct statement about mitochondria?
A. They are single-membrane organelles.
B. They have their own circular DNA.
C. They contain 80S ribosomes.
D. They are found in both prokaryotes and eukaryotes.
Answer: Option B
Solution (By JKSSB Mock Tests)
Mitochondria are double-membrane organelles with circular DNA (like prokaryotes) and 70S ribosomes, supporting the endosymbiotic origin. They are absent in prokaryotes. They are the site of aerobic respiration. The matrix contains enzymes for Krebs cycle. The inner membrane forms cristae, housing electron transport chain and ATP synthase.
Explanation:
Musca domestica is the common housefly, a dipteran insect. Periplaneta americana is the American cockroach, Drosophila melanogaster is the fruit fly used in genetics, Apis indica is the Indian honeybee. Housefly can act as a mechanical vector for diseases like typhoid, cholera. Scientific names help precise identification.
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