Q. Which one is common in the nucleus, chloroplast and mitochondria?
NTA AbhyasNTA Abhyas 2020
Solution:
Chloroplasts and Mitochondria are known as “Semi-autonomous organelles” of the cell because they have their genetic system (ds-DNA, RNA) and complete protein synthesis machinery.
Mitochondria also possess a complete protein synthesis apparatus, but the ribosomes present here are (70s) and similarly, ribosome of chloroplasts even(70s).
Also, chloroplasts have a small double-stranded circular DNA whereas Mitochondria have a single, double-stranded and circular naked DNA.
So both options A and B are wrong.
The common feature present in Chloroplasts, mitochondria and nucleus is that all 3 of them are bound by a double limiting membrane, i.e. an outer and an inner membrane.
So, the correct answer is C.
Mitochondria also possess a complete protein synthesis apparatus, but the ribosomes present here are (70s) and similarly, ribosome of chloroplasts even(70s).
Also, chloroplasts have a small double-stranded circular DNA whereas Mitochondria have a single, double-stranded and circular naked DNA.
So both options A and B are wrong.
The common feature present in Chloroplasts, mitochondria and nucleus is that all 3 of them are bound by a double limiting membrane, i.e. an outer and an inner membrane.
So, the correct answer is C.