Multiple Choice
Which of the following membrane-enclosed organelles is surrounded by two phospholipid bilayers?
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13. Intracellular Protein Transport
Membrane Enclosed Organelles
Multiple Choice
Which membrane-enclosed organelle is the primary site of cholesterol synthesis in eukaryotic cells?
A
Rough endoplasmic reticulum (RER)
B
Golgi apparatus
C
Smooth endoplasmic reticulum (SER)
D
Mitochondrion
Verified step by step guidance1
Understand that cholesterol synthesis is a biochemical process involving multiple enzymatic reactions that occur within a specific organelle in eukaryotic cells.
Recall the functions of the given organelles: the Rough Endoplasmic Reticulum (RER) is primarily involved in protein synthesis due to the presence of ribosomes; the Golgi apparatus modifies, sorts, and packages proteins and lipids; mitochondria are the site of ATP production through cellular respiration.
Recognize that the Smooth Endoplasmic Reticulum (SER) lacks ribosomes and is specialized in lipid metabolism, including the synthesis of cholesterol and other lipids.
Identify that cholesterol synthesis requires enzymes embedded in the membrane of the SER, making it the primary site for this process.
Conclude that among the options, the Smooth Endoplasmic Reticulum (SER) is the correct organelle responsible for cholesterol synthesis in eukaryotic cells.
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