Question

which organelle can build protein and lipids (fat) for the cell? endoplasmic reticulum ribosomes golgi apparatus lysosomes

Explanation:

The endoplasmic reticulum (ER) has two types. The rough ER (with ribosomes attached) is involved in protein synthesis. The smooth ER is responsible for lipid (fat) synthesis. Ribosomes mainly focus on protein synthesis. The Golgi apparatus modifies, sorts, and packages proteins and lipids. Lysosomes are for digestion and waste removal. So the endoplasmic reticulum is the organelle that can build both proteins and lipids for the cell.

Answer:

endoplasmic reticulum