Which organelle is the primary site of protein synthesis in cells?

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

Which organelle is the primary site of protein synthesis in cells?

Explanation:
Proteins are built by ribosomes, the cellular machines that translate the genetic message carried by mRNA into a chain of amino acids. Ribosomes can float freely in the cytoplasm or be attached to the rough endoplasmic reticulum, and in either place they form the peptide bonds that link amino acids together to make a protein. The rough ER helps with folding and processing and then passes proteins to the Golgi apparatus, which packages and ships them to their destinations. The nucleolus, instead, makes ribosome components (rRNA and ribosomal subunits) but does not perform protein synthesis itself. So the ribosome is where the actual building of proteins occurs.

Proteins are built by ribosomes, the cellular machines that translate the genetic message carried by mRNA into a chain of amino acids. Ribosomes can float freely in the cytoplasm or be attached to the rough endoplasmic reticulum, and in either place they form the peptide bonds that link amino acids together to make a protein. The rough ER helps with folding and processing and then passes proteins to the Golgi apparatus, which packages and ships them to their destinations. The nucleolus, instead, makes ribosome components (rRNA and ribosomal subunits) but does not perform protein synthesis itself. So the ribosome is where the actual building of proteins occurs.

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