Practice question

MCQ

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?

Options

Choose one · Correct answer highlighted

X and Y are parts of the endomembrane system because both contain DNA. X is a lysosome, while Y is a vacuole specialised for ion accumulation. X performs photosynthesis, while Y carries out intracellular digestion. X is a mitochondrion involved in aerobic respiration, while Y is a chloroplast involved in photosynthesis; both possess components for internal protein synthesis. Correct

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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