The citric acid cycle occurs in the ______ and results in ________ ATP molecules.
cytoplasm; 2
cytoplasm; 30
mitochondria; 2
mitochondria; 28
The Correct Answer is C
A. cytoplasm; 2: The cytoplasm is where glycolysis occurs, producing 2 ATP molecules per glucose. The citric acid cycle does not take place in the cytoplasm.
B. cytoplasm; 30: The citric acid cycle does not occur in the cytoplasm, and it does not directly produce 30 ATP; this higher yield comes from combined cellular respiration including the electron transport chain.
C. mitochondria; 2: The citric acid cycle occurs in the mitochondrial matrix. Each turn of the cycle produces 1 ATP (or GTP) per acetyl-CoA; since one glucose yields 2 acetyl-CoA, a total of 2 ATP are produced directly by the citric acid cycle.
D. mitochondria; 28: While the citric acid cycle generates high-energy electron carriers (NADH and FADH₂) that lead to ATP production in the electron transport chain, the cycle itself directly produces only 2 ATP per glucose molecule.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. glucose is formed from noncarbohydrate molecules:Gluconeogenesis is the metabolic process in which glucose is synthesized from noncarbohydrate precursors such as amino acids, lactate, and glycerol. This process primarily occurs in the liver and helps maintain blood glucose levels during fasting or intense exercise.
B. glycogen is formed:The formation of glycogen from glucose is called glycogenesis, not gluconeogenesis. Glycogenesis stores glucose for later use rather than producing it from noncarbohydrate sources.
C. glucose is converted into carbon dioxide and water:The breakdown of glucose into carbon dioxide and water occurs during cellular respiration, specifically glycolysis, the Krebs cycle, and oxidative phosphorylation, not gluconeogenesis.
D. glycogen is broken down to release glucose:The breakdown of glycogen to release glucose is called glycogenolysis. This process provides glucose when energy is needed but does not involve the formation of glucose from noncarbohydrate sources.
Correct Answer is A
Explanation
True:Hyperplasia refers to an increase in the number of cells in a tissue or organ, often in response to a specific stimulus or increased functional demand. It is a controlled process that occurs when additional cells are needed, such as during tissue repair or in response to hormonal signals.
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