Which organelle is the site of protein modification, glycogen, lipid synthesis, and chemical redox?

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Multiple Choice

Which organelle is the site of protein modification, glycogen, lipid synthesis, and chemical redox?

Smooth endoplasmic reticulum is the site where lipids are synthesized and where redox-based detoxification processes occur, thanks to enzymes in its membrane. In liver cells, it also handles aspects of glycogen metabolism, such as the final steps of glucose production that occur in the ER lumen. While protein modification is classically the job of the rough ER, the smooth ER’s environment and enzymatic toolkit make it the best match for all four functions listed. The other organelles specialize more narrowly: the rough ER for protein synthesis and folding, the Golgi for further processing and sorting of proteins, and lysosomes for degradation.

Smooth endoplasmic reticulum is the site where lipids are synthesized and where redox-based detoxification processes occur, thanks to enzymes in its membrane. In liver cells, it also handles aspects of glycogen metabolism, such as the final steps of glucose production that occur in the ER lumen. While protein modification is classically the job of the rough ER, the smooth ER’s environment and enzymatic toolkit make it the best match for all four functions listed. The other organelles specialize more narrowly: the rough ER for protein synthesis and folding, the Golgi for further processing and sorting of proteins, and lysosomes for degradation.

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