University:
Kentucky State University
Course:
BIO 408 | Cell Biology
Academic year:

2020
Views:

233

Pages:

18
Author:

imophulebf12

Chapter10 (Cell Respiration) (L A molecule becomes more oxidized when it Concept 10.1) SHOW HINT gains a hydrogen (H") ion changes shape gains an electron loses a hydrogen (H*) ion loses an electron Correct. During oxidation, an electron is removed. 2) In the overall process of glycolysis and cellular respiration, reduced. is oxidized and SHOW HINT Concept. 10.1) glucose oxygen glucose ATP carbon dioxide water oxygen... ATP ATP oxygen Correct. In cellular respiration, electrons and hydrogen are removed from glucose and added to oxygen. 3) Most of the ATP produced in cellular respiration comes from which of the following processes? (Concept 10.11 SHOW HINT reduction of NADH the citric acid cycle oxidative phosphorylation glycolysis substrate-level phosphorylation Correct. After hydrogen ions are pumped into the mitochondrial intermembrane space, they flow back through ATP synthase, which produces most of the ATP associated with cellular respiration. 4) Which of the following is a correct description of the events of cellular respiration in proper sequence? Concept 10.1) SHOW HINT glycolysts: oxidative phosphorylation; citric acid cycle; oxidation of pyruvate oxidation of glucose to pyruvate; oxidation of pyruvate: citric acid cycle: oxidative phosphorylation glycolysis; reduction of pyruvate, citric acid cycle, oxidative phosphorylation oxidation of pyruvate, citric acid cycle; oxidation of glucose to pyruvate, oxidative phosphorylation oxidation of glucose to pyruvate; reduction of pyruvate, citric acid cycle: oxidative phosphorylation Correct. This is the correct sequence of events in cellular respiration. 21) When a poison such as cyanide blocks the electron transport chain, glycolysis and the citric acid cycle also eventually stop working. Which of the following is the best explanation for this? Concept 104) SHOW HINT They run out of ADP A high level of NADH is present in the cell Electrons are no longer available from the electron transport chain to power glycolyole and the citric acid cycle NAD and FAD are not available for glycolysis and the citric acid cycle to continue. The uptake of oxygen stops because electron transport was inhibited. Correct. Unless the electron transport molecules (NADH and FADH2) can recycle back to their oxidized states (NAD and FAD), they will be unable to receive electrons in the other steps of cellular respiration. 22) Most of the electrons removed from glucose by cellular respiration are used for which of the following processes? (Concept 10.4) SHOW HINT reducing NAD to NADI I in glycolysis and the citric acid cycle producing a proton gradient for ATP synthesis in the mitochondria driving substrate-level phosphorylation in glycolysis. The first two choices are correct. The second and third answers are correct Correct. Electrons from oxidation of glucose are used to reduce NAD and produce a proton gradient for ATP synthesis in the mitochondria. 23) Each ATP molecule contains about 1% of the amount of chemical energy available from the complete oxidation of a single glucose molecule. Cellular respiration produces about 32 ATP from one glucose molecule. What happens to the rest of the energy in glucose?Concept 10.4) SHOW HINT It is converted to heat. It is converted to starch. It is stored as fat. It is released as carbon dioxide and water It is used to make water from hydrogen ions and oxygen. Correct. The process is only about 38% efficient, with the rest of the energy lost as heat. 24) During aerobic respiration, molecular oxygen (O2) is used for which of the following purposes? Concept 10.4) SHOW HINT as a source of Os in every reaction that produces CO2 at the end of the citric acid cycle to regenerate citric acid at the end of the electron transport chain to accept electrons and form H₂O between glycolysis and the citric acid cycle to split a carbon from pyruvate, producing CO₂ at the end of glycolysis to oxidize pyruvate Correct. O₂ is the final electron acceptor.

Chapter 10 Cell Respiration

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