Genome location in eukaryotes — Identify all organelles that contain DNA in a typical eukaryotic cell

Introduction:
Eukaryotic cells compartmentalize functions within organelles, and DNA is housed in specific locations. This question evaluates recognition of all eukaryotic sites that contain their own genetic material.

Given Data / Assumptions:

• Typical animal cell context (though plant chloroplasts also contain DNA).
• Organelles listed: nucleus, mitochondrion, vacuole, Golgi apparatus.

Concept / Approach:
Eukaryotes possess nuclear DNA enclosed by the nuclear envelope. Mitochondria also maintain circular DNA and a prokaryote-like translation system, consistent with the endosymbiotic origin. Vacuoles and the Golgi apparatus do not contain their own DNA.

Step-by-Step Solution:

Verification / Alternative check:
In plants and algae, chloroplasts also contain DNA (cpDNA). If chloroplast were among options, it would be included; here it is not, so the best answer remains nucleus and mitochondrion.

Why Other Options Are Wrong:

• Nucleus only: ignores mitochondrial DNA.
• Mitochondrion only: ignores the main nuclear genome.
• Vacuole: lacks DNA.
• Golgi apparatus: lacks DNA, functions in post-translational processing and trafficking.

Common Pitfalls:
Assuming every membrane-bound compartment contains DNA; most organelles rely on nuclear-encoded proteins and do not carry genomes.

Final Answer:
Both (a) and (b).