In what structure of the mammalian cell are proteins synthesized?

Question

Quizplus · Accepted Answer

Proteins are synthesized in ribosomes, which may be free in the cytoplasm or attached to the endoplasmic reticulum. The nucleus contains DNA and directs the cell's activities, but it does not directly synthesize proteins. The cell membrane plays a role in transport of materials in and out of the cell, but it is not involved in protein synthesis. The mitochondria are the organelles responsible for cellular respiration and energy production, but not protein synthesis.

In What Structure of the Mammalian Cell Are Proteins Synthesized