Multiple Choice
Which of these cellular components is not considered a membrane bound organelle?
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13. Intracellular Protein Transport
Membrane Enclosed Organelles
Multiple Choice
Which of the following membrane-enclosed organelles is surrounded by two phospholipid bilayers?
A
Mitochondrion
B
Lysosome
C
Golgi apparatus
D
Peroxisome
Verified step by step guidance1
Step 1: Understand the structure of cellular organelles and their membranes. Most membrane-enclosed organelles in eukaryotic cells are surrounded by a single phospholipid bilayer, which acts as a barrier separating the organelle's interior from the cytoplasm.
Step 2: Recall that mitochondria are unique among organelles because they have a double membrane structure. This means they are enclosed by two phospholipid bilayers: an outer membrane and an inner membrane.
Step 3: Recognize the functional significance of the two membranes in mitochondria. The outer membrane serves as a boundary with the cytoplasm, while the inner membrane is highly folded (forming cristae) and is the site of the electron transport chain and ATP synthesis.
Step 4: Compare this to other organelles listed: lysosomes, Golgi apparatus, and peroxisomes, which are all surrounded by a single phospholipid bilayer membrane.
Step 5: Conclude that the mitochondrion is the organelle surrounded by two phospholipid bilayers, distinguishing it structurally and functionally from the other organelles listed.
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