the sites of protein synthesis in the cell

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Multiple Choice

the sites of protein synthesis in the cell

Explanation:
Proteins are built at ribosomes, the cell’s protein-synthesis machines. They can float freely in the cytoplasm to make cytosolic proteins, or be attached to the rough endoplasmic reticulum, where they translate proteins that are to be secreted, inserted into membranes, or sent to lysosomes. The nucleus is where transcription happens—DNA is copied into mRNA—before translation. Mitochondria have their own small set of ribosomes and can make a few proteins inside the organelle, but most cellular protein production comes from ribosomes either free in the cytosol or on the rough ER. The endoplasmic reticulum itself isn’t where translation occurs; it houses ribosomes that are translating proteins and helps with folding and processing after synthesis.

Proteins are built at ribosomes, the cell’s protein-synthesis machines. They can float freely in the cytoplasm to make cytosolic proteins, or be attached to the rough endoplasmic reticulum, where they translate proteins that are to be secreted, inserted into membranes, or sent to lysosomes. The nucleus is where transcription happens—DNA is copied into mRNA—before translation. Mitochondria have their own small set of ribosomes and can make a few proteins inside the organelle, but most cellular protein production comes from ribosomes either free in the cytosol or on the rough ER. The endoplasmic reticulum itself isn’t where translation occurs; it houses ribosomes that are translating proteins and helps with folding and processing after synthesis.

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