Horses and donkeys can interbreed, but their offspring (mules) are infertile. This is an example of what kind of reproductive is
1 answer:
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Answer:
C.Mature secretory vesicles
Explanation:
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Insulin is synthesized in pancreatic ß-cells. It is a small protein formed by two amino acid chains (A-chain, 21aa, and B-chain, 30aa) connected by two disulfuric chains.
The gene encoding is located in the short arm of chromosome 11. Its precursor, called preproinsulin, is synthesized in the endoplasmic reticulum. Right after its synthesis, this protein undergoes enzymatic cleavage to proinsulin (86 aa).
The prohormone is packed in small granules within the Golgi complex, that migrates to the cell surface. As the granules mature, 3 proteases split the proinsulin into equal amounts of insulin and C-peptide.
These secretory granules are stored within the intracellular space until their contents are released by exocytosis.
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<em>Image from Guyton and Hall Textbook of Medical Physiology, unit XIV, chapter 79</em>
