MA 1) Steps of cellular respiration are: (multiple answers may be correct) A. Fe
ID: 197132 • Letter: M
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MA 1) Steps of cellular respiration are: (multiple answers may be correct) A. Fermentation B. Oxidative carboxylation of pyruvate C. Citric Acid Cycle D. Mitochondrial Electron Transport Chain E. Reduction of molecular Oxygen by cytochrome C MA 2) Steps of Oxidative Phosphorylation (in a wider sense) are: (multiple answers may be correct) A. Fermentation B. Glycolysis C. Mitochondrial electron transport chain D. Reduction of molecular Oxygen by cytochrome C E. H+ gradient driven synthesis of ATP MC 3) Which of the following is correct? (only one answers is correct) A. The outer mitochondrial membrane contains unselective pores formed by porins allowing many types of molecules and ions to pass. B. The inner mitochondrial membrane is a major permeability barrier. C. Both of the above D. None of the aboveExplanation / Answer
1) The correct option is C and D.
The three main stages of cellular respiration include Glycolysis, the Kreb's Cycle and the Electron Transport Chain.
2) The correct option is C and E.
Oxidative phosphorylation happens in two steps: the electron transport chain and chemiosmosis.
The enzymes in electron transport system use the energy released from the oxidation of NADH to pump protons across the inner membrane of the mitochondrion and protons are formed in the inter membrane space and generates an electrochemical gradient across the membrane.
Chemiosmosis is the movement of ions across a semi-permeable membrane, down their electrochemical gradient. The formation of ATP by the movement of hydrogen ions across a membrane during the process of cellular respiration or photosynthesis.
3) The correct option is C.
Outer mitochondrial membrane has poring, therefore relatively non-selective. Outer membrane is quite permeable due to porins and pores. Pores in the outer membrane formed by rich mitochondrial protein porin, which form the outer membrane highly permeable to most small molecules. Therefore the inner mitochondrial membrane is a permeability barrier for small molecules between cytosol and mitchondrial matrix.
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