A scientist performed an experiment to separate cell structures in animal cells. The cells were ruptured so that the cell structures were released. This mixture was filtered into a centrifuge tube and then spun in a centrifuge. The heaviest cell structure settled at the base, producing pellet 1, as shown in the diagram. The liquid above pellet 1 was transferred into a clean centrifuge tube and spun again in the centrifuge at a higher speed to separate the next heaviest cell structure. This cell structure settled at the bottom, forming pellet 2. This process was carried out twice more to produce pellet 3 and pellet 4, each of which contained one type of cell structure. Which row indicates the sequence in which the cell structures were collected?
- Apellet 1: nucleus; pellet 2: lysosomes; pellet 3: mitochondria; pellet 4: ribosomes
- Bpellet 1: nucleus; pellet 2: mitochondria; pellet 3: lysosomes; pellet 4: ribosomes
- Cpellet 1: ribosomes; pellet 2: lysosomes; pellet 3: mitochondria; pellet 4: nucleus
- Dpellet 1: ribosomes; pellet 2: mitochondria; pellet 3: lysosomes; pellet 4: nucleus