Question

Select the incorrect statement regarding that organelle of animal cell which has its own DNA and ribosomes. (1) The energy required for various chemical activities needed for life is released by it in the form of ATP molecules (2) Its outer membrane is deeply folded while the inner membrane is very porous (3) Its deeply folded membrane creates a large surface area for ATP-generating chemical reactions (4) It is able to make some of its own proteins

Answer 1

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option A is the answer.


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Answer 2

Answer:

The correct answer would be (2) Its outer membrane is deeply folded while the inner membrane is very porous.

In animal cell, mitochondria is a cell organelle which has its own DNA and ribosome.

• It is a double membrane bound structure in which outer membrane is more permeable to small molecules and it contains proteins channels for larger molecules.
• In contrast, inner membrane is less or non permeable. Most the molecules require channel proteins in order to pass through it.
• Inner membrane folds inwards to form cristae and carries all the protein complexes associated with electron transport chain including ATP synthase.
• Mitochondria is also known as the powerhouse of the cell as it generates most of the ATP required by the cell for its metabolic processes.
• It is also called as semi-autonomous organelle as it contains its own DNA which can replicate independently. In addition, this DNA can produce its own mRNA, tRNA and rRNA and thus can form most of the structural proteins required by it. However, it depends on the nuclear DNA for rest of its protein such as functional enzymes etc.