Practice question
Question
Organelles X and Y both contain circular DNA and 70S ribosomes. X has cristae, while Y contains thylakoids surrounded by stroma. Which interpretation is best supported?
Explanation
Cristae identify X as a mitochondrion, while thylakoids and stroma identify Y as a chloroplast. Mitochondria perform aerobic respiration and generate ATP; chloroplasts trap light energy. Their circular DNA and 70S ribosomes support some protein synthesis within both organelles.
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