Assertion : Mitochondria and chloroplasts are semi-autonomous...

Mitochondria and chloroplasts both are double membrane organelles. They are semi autonomous as both their structure and functions are partially controlled by nucleus of the cell and partially themselves. Both possess their own DNA and arises from pre-existing cells. Synthesis of many amino acids occurs in mitochondria. The first formed amino acids are glutamic acid and aspartic acid. Plastid also manufacture some of its own proteins, enzymes and other chemicals because of the presence of $70 \mathrm{~s}$ ribosomes which can help translate the coded information contained in mRNAs transcribed over chloroplast DNA.