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Question

Read the following statements. 
(a) Ribosomes are larger than that of cytoplasmic ribosomes.
(b) Two membranes have their own specific enzymes.
(c) Matrix has single stranded, circular, naked DNA molecule.
(d) Number is variable depending on the physiological activity of the cell.
(e) Inner membrane forms a number of infoldings called cristae towards the matrix.

How many of the above are correct for the power house of the cell? 
  1. Four
  2. Two
  3. Three
  4. Five


Solution

The correct option is C Three
Mitochondrial ribosomes are 70S type hence smaller than cytoplasmic ribosomes which has 80S ribosomes.

Outer membrane of mitochondria contains enzymes of fatty acids, degradation of tryptophan while inner membrane contains enzymes of electron transport system (ETS).

DNA of mitochondria is always double stranded circular and not single stranded.

Number of mitochondria in a cell depends on metabolic activity of cell.

Inner mitochondrial membrane infolds to form cristae to increase surface area in matrix.

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