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chromosomes gather in the nucleus, the nuclear membrane reforms around the chromosomes, and cell division begins to occur
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- In an experiment, the F1 portion of the ATP synthase was attached to a glass slide, and fluorescently labeled microfilaments were attached to its central peptide. The rotation of the ATP synthase was observed when ATP was added. Because there was no proton gradient to drive the molecular motor in the direction of ATP synthesis, ATP was hydrolyzed to ADP and Pi, and this energy caused the motor to spin. When ATP plus oligomycin was added to the slide, the rotation continued even though oligomycin can inhibit ATP hydrolysis in mitochondrial inner membrane vesicles containing ATP synthase (F1-F0). Based on your knowledge of ATP synthase, which hypothesis is supported by these observations?
- If a cell has a greater concentration of solute than its environment A. the cell is hypertonic to the environment. B. the cell is isotonic to the environment. C. the cell is hypotonic to the environment. D. the cell will not experience a net gain or loss of water. E. the cell will crenate.
- Under ideal conditions each NADH molecule will result in 3 ATP molecules, and each FADH2 molecule will result in 2 ATP molecules during oxidative phosphorylation. Calculate the total number of ATP molecules that might be produced in this phase of cellular respiration from one glucose molecule.