The part of the plant cell that stores information about making protein is the nucleus.

Here's why:

* DNA: The nucleus contains the cell's DNA, which is the genetic blueprint for the organism. This DNA contains the instructions for making all the proteins a cell needs.

* Transcription: The process of making proteins starts in the nucleus. DNA is transcribed into RNA, a messenger molecule that carries the protein-making instructions out of the nucleus.

* Translation: The RNA molecule travels to the ribosomes in the cytoplasm, where the instructions are translated into a specific protein sequence.

So, the nucleus is the central command center for protein synthesis. It holds the blueprints and starts the process of building proteins.