Which Organelle Contains Its Own DNA Molecule

Question

Which organelle contains its own DNA molecule?
A) ribosome
B) mitochondria
C) Golgi apparatus
D) smooth endoplasmic reticulum

Accepted Answer

Mitochondria contain their own DNA molecule, which is separate from the DNA in the nucleus. This is because mitochondria are thought to have originated from free-living bacteria that were engulfed by early eukaryotic cells. Ribosomes do not contain DNA, as they are made up of RNA and proteins. The Golgi apparatus and smooth endoplasmic reticulum also do not contain DNA.