Final answer:
The correct answer is that glycolysis occurs in the cytoplasm, and the Krebs cycle and electron transport chain occur in the mitochondria, specifically within the mitochondrial matrix and the inner mitochondrial membrane respectively.
Step-by-step explanation:
Glycolysis takes place in the cytoplasm of the cell, while the Krebs cycle and the electron transport chain take place within the mitochondria. The Krebs cycle occurs specifically in the mitochondrial matrix, and the electron transport chain is located in the inner mitochondrial membrane. Therefore, the answer to the question is that glycolysis takes place in the cytoplasm, and the Krebs cycle and electron transport chain take place in the mitochondria.
The final answer in 2 lines for the question is: Glycolysis occurs in the cytoplasm, and the Krebs cycle and electron transport chain occur in the mitochondria. To explain in 140 words, glycolysis is the process in which glucose is broken down into pyruvate, yielding energy in the form of ATP and NADH while occurring in the cytoplasm. The pyruvate is then transferred to the mitochondria where it is used in the Krebs cycle to produce more energy carriers. The electrons from these carriers are eventually passed through the electron transport chain in the inner mitochondrial membrane, leading to the generation of a large amount of ATP.