How many membranes enclose a mitochondrion?
ATwo membranes
BOne membrane
CThree membranes
DFour membranes
Answer & Solution
Correct answer: A. Two membranes
1. A mitochondrion is bounded by a double membrane.
2. The outer membrane is smooth and forms the boundary.
3. The inner membrane folds inwards to form the cristae, which carry the respiratory enzymes.
4. The space enclosed by the inner membrane is the matrix.
5. Drawing three layers instead of two is a frequent error in the diagram.
_Source: NECTA ACSEE 2023 Biology 133/1, Question 1: Cytology_
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