Question
DNA is present in which one of the organelle?
| A. | Mitochondria |
| B. |
Lysosome |
| C. |
Endoplasmic reticulum |
| D. |
Cytoplasm |
Show Answer
|
Correct Answer � A Explanation |
 |
- Mitochondria contain their own DNA, known as mitochondrial DNA (mtDNA), which is separate from the nuclear DNA.
- This DNA is circular, similar to bacterial DNA, and encodes for proteins involved in the mitochondrial electron transport chain, tRNAs, and rRNAs.
- Mitochondrial DNA enables mitochondria to replicate and transcribe some of their proteins independently of the cell nucleus.
Reasons to rule out other options:
Option B. Lysosome:
- Lysosomes are organelles containing hydrolytic enzymes for breaking down macromolecules. They do not have DNA.
Option C. Endoplasmic Reticulum:
- The endoplasmic reticulum (ER) is involved in protein synthesis (rough ER) and lipid metabolism (smooth ER), but it does not contain DNA.
Option D. Cytoplasm:
- The cytoplasm contains various organelles and macromolecules, but DNA itself is not freely present here. The main DNA in eukaryotic cells is confined to the nucleus and mitochondria.
