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Mitochondria and Chloroplasts
Concepts tested here
- Comparison of chloroplast and mitochondrion
All Questions
2007 AIPMT-PRE 1 question
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Select the wrong statement from the following.
Thylakoids are flattened membranous sacs found only in chloroplasts. They are arranged in stacks called grana, and the space enclosed by the thylakoid membrane is the thylakoid space or lumen.
Mitochondria do not have thylakoids. Their inner membrane is folded into cristae, and the inner compartment is called the matrix.
So the statement that both chloroplasts and mitochondria have a thylakoid space bounded by the thylakoid membrane is wrong.
Both organelles are double membrane-bound, with an outer and an inner membrane.
Both contain their own circular DNA, RNA and 70S ribosomes, and are semi-autonomous.
Chloroplasts (5-10 micrometres long) are generally much larger than mitochondria (about 1-4 micrometres long).
The other three statements are therefore correct.