Cells - The Unit of Life
In mitochondria, protons accumulate in the
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Single Choice
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.
A(i) and (ii)
B(iii) and (iv)
C(i), (ii) and (iii)
Correct Answer
D(i), (ii), (iii) and (iv)
Solution
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 ($$70S$$ 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)'.
SIMILAR QUESTIONS
Cells - The Unit of Life
Match the following: Column I Column II (a) Cristae (i) Flat membranous sacs in stroma (b) Cisternae (ii) Infoldings in mitochondria (c) Thylakoids (iii) Disc-shaped sacs in Golgi apparatus
Cells - The Unit of Life
Who coined the term mitochondria?
Cells - The Unit of Life
In which of the following parts of mitochondria succinic dehydrogenase enzyme is located?
Cells - The Unit of Life
Which of the following observations most strongly support the view that mitochondria contain electron transport enzymes aggregated into compact association?
Cells - The Unit of Life
Which of the following observations most strongly support the view that mitochondria contain electron transport enzymes aggregated into compact association?
Cells - The Unit of Life
The stain used to visualise mitochondria is
Cells - The Unit of Life
Mitochondria and plastids have their own DNA (genetic material). What is known about their fate during nuclear division like mitosis?
Cells - The Unit of Life
In which of the following parts of mitochondria succinic dehydrogenase enzyme is located?
Cells - The Unit of Life
Oxysome of mitochondria are concerned with
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