Multiple Choice
Where in the cell does the citric acid (Krebs) cycle take place?
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8. Respiration
Krebs Cycle
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The Krebs cycle occurs in which portion of the cell?
A
Mitochondrial matrix
B
Cytoplasm
C
Nucleus
D
Endoplasmic reticulum
Verified step by step guidance1
Understand the Krebs cycle: The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.
Identify the location of the Krebs cycle: The Krebs cycle occurs in the mitochondria, which are specialized organelles responsible for energy production in eukaryotic cells.
Focus on the mitochondrial matrix: Within the mitochondria, the Krebs cycle specifically takes place in the mitochondrial matrix, which is the innermost compartment of the mitochondria. This area contains the enzymes necessary for the cycle.
Eliminate incorrect options: The cytoplasm is where glycolysis occurs, not the Krebs cycle. The nucleus is involved in genetic material storage and transcription, and the endoplasmic reticulum is involved in protein and lipid synthesis, not energy production.
Conclude with the correct answer: Based on the information above, the correct location of the Krebs cycle is the mitochondrial matrix.
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