Multiple Choice
In eukaryotic cells, what is the key structural and functional difference between rough endoplasmic reticulum (rough ER) and smooth endoplasmic reticulum (smooth ER)?
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13. Intracellular Protein Transport
Membrane Enclosed Organelles
Multiple Choice
In eukaryotic cells, which organelle is enclosed by a double membrane (an inner and outer membrane)?
A
Peroxisome
B
Mitochondrion
C
Lysosome
D
Golgi apparatus
Verified step by step guidance1
Understand the question: It asks which organelle in eukaryotic cells is enclosed by a double membrane, meaning it has two distinct lipid bilayers surrounding it.
Recall the structure of each organelle listed: Peroxisomes, lysosomes, and the Golgi apparatus are all surrounded by a single membrane, not two.
Focus on the mitochondrion: It is known as the powerhouse of the cell and is unique because it has both an inner and an outer membrane, making it a double-membrane organelle.
Recognize the significance of the double membrane in mitochondria: The outer membrane encloses the organelle, while the inner membrane folds inward to form cristae, increasing surface area for energy production.
Conclude that the mitochondrion is the correct answer because it is the only organelle among the options that has a double membrane structure.
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