AP BIOLOGY

Detailed explanation-1: -Ribosomes are cell organelles that function in the synthesis of proteins. They are present on the surface of rough endoplasmic reticulum. They produce proteins from amino acids by a process called protein synthesis. Therefore, ribosomes are called protein factories as they synthesize proteins.

Detailed explanation-2: -Nucleolus: the ribosome factory.

Detailed explanation-3: -Final answer: Ribosomes are known as the protein factory of the cell.

Detailed explanation-4: -Ribosomes synthesize proteins by gathering and assembling amino acids into protein chains. Since ribosomes are the only cell organelle involved in the synthesis of protein, they are called the protein factory of the cell.