Which cell organelle makes fats and proteins?

The endoplasmic reticulum (ER) is the cell organelle responsible for synthesizing fats and proteins. There are two types of ER: the rough ER, which is studded with ribosomes and primarily involved in protein synthesis, and the smooth ER, which is involved in lipid synthesis and metabolism. Together, they play a crucial role in the production and processing of these essential biomolecules.