Final answer:
A cell that synthesizes steroid hormones would have the greatest concentration of smooth endoplasmic reticulum. Cells like Leydig cells in the testes and ovarian cells need substantial SER for the synthesis of phospholipids and steroid hormones.
Step-by-step explanation:
The cell type that would most likely have the greatest concentration of smooth endoplasmic reticulum (SER) is one that synthesizes lipids and steroid hormones. Cells that are actively involved in these processes, such as Leydig cells in the testes and cells within the ovaries, generally contain a substantial amount of SER. The smooth ER specializes in the synthesis of phospholipids, which are essential components of biological membranes, as well as the synthesis of steroid hormones.
The smooth ER also has other vital functions such as detoxifying medications and poisons, storing calcium ions, and in certain cells, regulating the concentration of cellular calcium which is crucial for neurotransmitter release in the nervous system. Therefore, among the options provided, a cell that makes steroid hormones would have the largest amount of SER as this organelle is crucial for the synthesis of these hormones.