What is the use of density plots in flow cytometry?

The correct answer highlights that density plots visualize two measurement parameters by representing the data in a way that emphasizes the concentration of cells within a certain range of the parameters being measured. In flow cytometry, density plots are particularly useful for illustrating the distribution of cells across two dimensions (for instance, fluorescence intensity of two different markers), allowing you to see where the majority of the data points are concentrated. This is essential for understanding the relationships between different cell populations based on these measurement parameters.

Each of the other options refers to different capabilities or uses of flow cytometry visualization methods. For instance, displaying size distribution of cells pertains more to scatter plots, typically forward and side scatter, whereas showing multiple markers on a single axis can be done via histograms or overlays, but it does not account for the two-dimensional view provided by a density plot. Similarly, quantifying cell adherence properties is generally addressed through other methodologies rather than through the density plot's focus on two measurable parameters in the context of cell populations. Thus, the choice highlights the distinctive advantage of using density plots for visualizing and analyzing complex relationships in flow cytometry data.