Help with Endoplasmic Reticulum Function - GRE Subject Test: Biochemistry, Cell, and Molecular Biology

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Question

Which of the following is a function of the smooth endoplasmic reticulum?

Answer

The smooth endoplasmic reticulum lacks ribosomes on its surface, meaning it does not participate in protein translation. It does play a key role in the production of various lipids, such as phospholipids and triglycerides.

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Question

Which of the following organelles has the function of storing intracellular calcium?

Answer

The endoplasmic reticulum, while crucial to protein synthesis, is also an intracellular calcium storage organelle, and calcium can be released in response to signaling cascades as needed. None of the other organelles listed participates in storage of calcium.

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Question

Where in the cell does new membrane synthesis take place?

Answer

The endoplasmic reticulum (ER) is the cellular organelle responsible for membrane synthesis. Products from the ER are moved to the Golgi, where they are tagged and shipped off to their final destination. Lysosomes are important for degradation and ribosomes play a role in translation. Mitochondria are for energy production in the form of ATP.

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