Hello I really need help with these BIO-1 questions. Could you guys please answe

Question

Hello I really need help with these BIO-1 questions. Could you guys please answer all of the multiple choice questions. I know it seems like a lot but i would highly appreciate it becuase i really need help on them. Thank you guys! I truly appreciate it.

pen to cytoplasmic enzyme activity inside a cell with a mic pH of 7.2 if you injected a chemical that would change 33. What would hap hormal cytoplasmic pH of 7.2 if you injected a chem the pH to 4.0? A. Little or no change would occur B. Enzymatic activity would decline. C. Enzymes would start to add ATP to all reactions. =-636 34. The oxidation of glucose to CO2 and H20 is highly exergonic: AG kcal/mole. This is spontaneous, but why is it very slow? A. Few glucose and oxygen molecules have the activation energy at room temperature. B. There is too much CO2 in the air. C. CO2 has higher energy than glucose he formation of six CO2 molecules from one glucose molecule decreases entropy D. T E. The water molecules quench the reaction 35. Which statement about the citric acid cycle is true? A. It occurs during the movement from the cytosol through the mitochondrial membranes B. It makes ATP through substrate-level phosphorylation. C. It makes the most ATP compared to the other steps in the breakdown of glucose. D. It occurs in the eukaryotic cytoplasm. E. It splits glucose 36. What is the purpose of fermentation reactions? A. to make alcohol or lactic acid that cells can metabolize for energy under anaerobic conditions B. to make additional ATP when respiration can't make ATP fast enough C. to regenerate NAD* so glycolysis can continue D. to slow down cellular oxygen consumption when oxygen is scarce E. to make organic molecules that cells can store until oxygen becomes available 37.For the complete extraction of energy from a molecule of glucose which of the following metabolic reactions must occur: A. glycolysis and pyruvate oxidation B. citric acid cycle and oxidative phosphorylation (electron transport chain +chemiosmosis) C. fermentation D. both A and B E. both A and C

Explanation / Answer

33. Answer: Enzymatic activity would decline. Explanation: Most enzymes are proteins, and proteins are polymers made of amino acids. Considering that pH can change the ionization state of an amino acid, which subsequently affects the 3D shape of a protein, including the active site where the substrate binds, therefore declining its activity.

34. Answer: Few glucose and oxygen molecules have the activation energy at room temperature. Explanation: Even though glucose is a high energy molecule, it requires to overcome its activation of energy for it to start releasing energy, which can be done by heating the glucose, though in our body cells heating will cause a lot of damage and the way cells handle that is by doing a chain of reaction to release all the energy from a glucose but by parts and helped by enzymes to avoid heating to reach the activation energy.

35. Answer: It makes the most ATP compared to the other steps in the breakdown of glucose. Explanation: Citric acid cycle, which takes place inside mitochondria, yields about 22 ATP molecules while glycolysis yields 5 and oxidation of pyruvate yields as well 5.

36. Answer: To regenerate NAD+ so glycolysis can continue. Explanation: During anaerobic oxidation of glucose, lactate is produced, which helps regenerate NAD+ from NADH by reduction of pyruvate to lactate.

37. Answer: Both A and B Explanation: Fermentation will only happen under anaerobic conditions, while aerobic fermentation consists of 4 steps: glycolysis, oxidation of pyruvate, citric acid cycle and oxidative phosphorylation

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