Study the following statements regarding mitochondria and select the correct ones.
(i) These are the sites of aerobic respiration.
(ii) Matrix contains single, circular dsDNA molecule, a few RNA molecules, $70 S$ ribosomes.
(iii) Mitochondria divide by fission.
(iv) Mitochondria are fully-autonomous.

(i) and (ii)

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(iii) and (iv)

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(i), (ii) and (iii)

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(i), (ii), (iii) and (iv)

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Solution

The correct option is A (i), (ii) and (iii)
Mitochondria are semi-autonomous organelles. However, mitochondria are not fully autonomous because their structure and functioning are partially controlled by nucleus of the cell and availability of materials from cytoplasm. So, it is more appropriate to call them semi-autonomous organelles. Semi- autonomy of mitochondria is because they have their own DNA which can replicate independently. Mitochondrial matrix possesses its own ribosomes ( $70 S$ in nature). It synthesizes some of its own structural proteins. New mitochondria, develop by division of pre-existing mitochondria.
So, the correct answer is '(i), (ii) and (iii)'.

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Study the following statements regarding mitochondria and select the correct ones.(i) These are the sites of aerobic respiration.(ii) Matrix contains single, circular dsDNA molecule, a few RNA molecules, 70S ribosomes.(iii) Mitochondria divide by fission.(iv) Mitochondria are fully-autonomous.