11. Which of the following stuatcmentsis FALSE All proteins kcalizedtothrmitchod
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11. Which of the following stuatcmentsis FALSE All proteins kcalizedtothrmitchodria areencoded bythe aitochondndinena. Cytochrome oxidase catalyzes the reduction of 02 to D.ATP synthase is capable of both synthesizing and hydrolyring ATP 12. The proton gradient and membrane potential across the inner mitochondrial membeane provide the energy needed to tranport which of the following molecules into the mitochondrial matrix? A) pyruvate+ lactic acid A. B and D. 13. Which of the following phospholipid movements occur spontancously within a lipid bilayer? A rotation & lateral diffusion , A and C B and C 14. Phospholipid head groups are polar and Within the context of a membrane, phospholipid acyl chains face the ilic; interior of the membrane & hydrophobic; interior of the membrane hydrophilic; extracellular space hydrophobic; cytoplasm hydrophobic; extracellular space 15. Protein secondary stractures such as alpha helices are rarely found in transmemberan proteins True B. FalseExplanation / Answer
11. A. All protiens localized in the mitochondria are encoded by mitochondrial genome.
Mitochondria is called as "semi autonomous body" and can synthesize some of its own protiens due to the presence of ira own genome but about 90% of mitochondria are encoded by nuclear genome.
12. A. Pyruvate.
Many charged molecules such as pyruvate are pumped from the cytosol into the matrix of mitochondria are driven by proton gradient. Carrier proteins in the mitochondrial membrane bind these molecules and couple their transport to the energetically favorable flow of H+ into the mitochondrial matrix.
13. A and C.
14. Hydrophillic; interior of the membrane.
Phospholipid molecules in membranes have one polar hydrophilic head and two non polar hydrophobic tails. Tails are arranged in such a way that they face the tails of phospholipids molecules of opposite lipif layer and lie in the interior of the membrane.
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