Multiple Choice
Which organelle is responsible for producing energy and is found in nearly all cells of plants and animals?
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5. Cell Components
Mitochondria & Chloroplasts
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Which structure in the mitochondrion is responsible for housing the enzymes of the electron transport chain?
A
Intermembrane space
B
Outer mitochondrial membrane
C
Mitochondrial matrix
D
Inner mitochondrial membrane
Verified step by step guidance1
Understand the structure of the mitochondrion: The mitochondrion is a double-membraned organelle with four main regions: the outer mitochondrial membrane, the intermembrane space, the inner mitochondrial membrane, and the mitochondrial matrix.
Recall the function of the electron transport chain (ETC): The ETC is a series of protein complexes and other molecules that transfer electrons to generate a proton gradient, which is used to produce ATP during oxidative phosphorylation.
Identify the location of the ETC: The protein complexes and molecules of the ETC are embedded in the inner mitochondrial membrane. This membrane's structure allows it to house these enzymes and facilitate the transfer of electrons and the pumping of protons into the intermembrane space.
Differentiate the roles of the mitochondrial regions: The outer membrane serves as a boundary, the intermembrane space accumulates protons during the ETC, the inner membrane contains the ETC enzymes and ATP synthase, and the matrix is where the citric acid cycle occurs.
Conclude that the inner mitochondrial membrane is the correct answer because it is the specific structure responsible for housing the enzymes of the electron transport chain.
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