When examining an endocrine cell from a new species of mammal under the microscope you find that it contains an abundance of rough endoplasmic reticulum, a large Golgi apparatus, and secretory granules. Which of the following is most likely to be true about these cells?
A. It secretes by endocytosis.
B. Its hormone product is synthesized from cholesterol.
C. It secretes a hormone with a hydrophobic structure.
D. It secretes a peptide/protein hormone.
E. It secretes its product by diffusion through the lipid bilayer of the plasma membrane.
Answer: D
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