Question

Which of the following statements are correct?
A. Mitochondria and chloroplast contain DNA and ribosomes for protein synthesis.
B. Mitochondria and chloroplast contain DNA but do not make protein.
C. These organelles are more related to bacteria/cyanobacteria than eukaryotes.
D. They are distinct entities and can survive outside the host cell.
E. They do not contain all the genes necessary to specify all their proteins.

• A. A, C and E
• B. A, C and D
• C. B
• D. A and D

Hint:

Remember: Mitochondria and Chloroplasts are "Semi-autonomous"—they have their own machinery but still need the nucleus to survive.

Answer 1

The Correct Option is A

Step 1: Analysis of A and B
Mitochondria and chloroplasts are semi-autonomous; they have their own DNA and 70S ribosomes to synthesize some of their own proteins (A is True, B is False).

Step 2: Analysis of C and D
The Endosymbiotic Theory states they evolved from bacteria (C is True). However, they are now dependent on the host and cannot survive independently (D is False).

Step 3: Analysis of E
Most of their proteins are encoded by nuclear DNA and imported from the cytoplasm (E is True).

Step 4: Conclusion
Statements A, C, and E are correct. Final Answer: (A)