Which structure is characterized by dimples and a maltese cross appearance?

The structure characterized by dimples and a Maltese cross appearance is starch granules. This distinctive appearance is due to the crystalline nature of starch, which can exhibit a pattern of birefringence when viewed under polarized light. The dimples correspond to the unique structural configuration of starch granules, which are formed from long chains of glucose units and can vary in size and shape depending on the source of the starch.

Hyaline casts, on the other hand, typically present as clear, colorless, and smooth structures in urine, lacking the intricate features seen in starch granules. Oil droplets generally appear as refractile and spherical structures, not exhibiting the Maltese cross pattern. Pollen grains have a specific structure and texture that does not resemble the characteristic appearance of starch under polarized light. Thus, starch granules stand out due to their specific visual properties when subjected to the right analytical techniques.