A mitochondrion is described as a cell within a cell mainly because it:
Acontains a Golgi apparatus inside
Bcarries its own DNA and ribosomes
Cis enclosed by three separate layers
Dholds a nucleus and cytoplasm
Answer & Solution
Correct answer: B. carries its own DNA and ribosomes
1. The claim rests on the mitochondrion having the machinery a cell needs to run itself.
2. It carries its own circular DNA and its own ribosomes, so it makes some of its own proteins.
3. It is bounded by a double membrane, matching a cell's own boundary.
4. It has no nucleus, no Golgi apparatus and no cytoplasm — those belong to the cell around it.
5. Naming a nucleus or cytoplasm is the common slip, and drawing three layers instead of two is the matching drawing error.
_Source: NECTA ACSEE 2023 Biology 133/1, Question 1: Cytology_
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