Density gradient centrifugation is used to separate cell structures according to their relative density. Because larger cell structures have a greater density, they sink farther down the centrifuge tube. What is the correct sequence of the cell structures, beginning at the top of the centrifuge tube?
- Achloroplasts $\rightarrow$ nuclei $\rightarrow$ mitochondria $\rightarrow$ ribosomes
- Bnuclei $\rightarrow$ chloroplasts $\rightarrow$ mitochondria $\rightarrow$ ribosomes
- Cribosomes $\rightarrow$ chloroplasts $\rightarrow$ nuclei $\rightarrow$ mitochondria
- Dribosomes $\rightarrow$ mitochondria $\rightarrow$ chloroplasts $\rightarrow$ nuclei