Which of the following statement regarding mitochondrial membrane is n...
The enzymes of electron transport system are present in inner mitochondrial membrane.
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Which of the following statement regarding mitochondrial membrane is n...
The enzymes of the election transfer chain are present in the inner membrane of mitochondria.
Which of the following statement regarding mitochondrial membrane is n...
The correct statement regarding the mitochondrial membrane is option 'A': The enzymes of the electron transfer chain are embedded in the outer membrane.
Explanation:
Mitochondria are double-membraned organelles found in eukaryotic cells. They are often referred to as the "powerhouses" of the cell because they generate most of the cell's energy in the form of ATP (adenosine triphosphate) through oxidative phosphorylation.
Mitochondrial Membrane Structure:
1. Outer Membrane:
- The outer membrane of the mitochondria is relatively porous and contains porin proteins that form channels for the passage of molecules.
- It acts as a barrier between the cytoplasm and the inner compartments of the mitochondria.
- The outer membrane is permeable to small molecules and ions.
2. Intermembrane Space:
- The space between the outer and inner membranes is known as the intermembrane space.
- It is important for the transport of metabolites and ions.
3. Inner Membrane:
- The inner membrane of the mitochondria is highly convoluted, forming a series of infoldings called cristae.
- The inner membrane is impermeable to most molecules due to its unique composition.
- It contains numerous proteins involved in ATP synthesis, including the enzymes of the electron transport chain (ETC).
- The ETC is responsible for generating a proton gradient across the inner membrane, which drives ATP synthesis.
4. Matrix:
- The inner compartment of the mitochondria is called the matrix.
- It contains enzymes involved in various metabolic pathways, including the citric acid cycle (Krebs cycle) and fatty acid oxidation.
- The matrix also contains mitochondrial DNA (mtDNA), ribosomes, and other components necessary for protein synthesis within the mitochondria.
Incorrect Statement:
Option 'A' states that the enzymes of the electron transfer chain are embedded in the outer membrane. This statement is incorrect because the enzymes of the ETC are actually embedded in the inner membrane of the mitochondria, not the outer membrane. The inner membrane is specifically adapted to carry out oxidative phosphorylation and ATP synthesis.
In summary, the correct statement regarding the mitochondrial membrane is that the enzymes of the electron transfer chain are embedded in the inner membrane, not the outer membrane.
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