The correct answer is: D. Endoplasmic Reticulum
The endoplasmic reticulum (ER) is a membrane-bound organelle found in eukaryotic cells. It is a network of tubules and sacs that is involved in a variety of cellular processes, including protein synthesis, lipid synthesis, and detoxification. The ER is also the site of ribosome production. Ribosomes are small organelles that are responsible for protein synthesis. They are made up of two subunits, a large subunit and a small subunit. The large subunit is made up of 60 ribosomal RNA (rRNA) molecules and 45 proteins, while the small subunit is made up of 32 rRNA molecules and 19 proteins. The ER is the site of ribosome production because it contains the enzymes and other proteins that are necessary for ribosome assembly. The ER also contains the ribosomal RNA (rRNA) that is used to make ribosomes.
The nucleus is the control center of the cell. It contains the cell’s DNA, which is the blueprint for the cell’s proteins. The nucleus also contains the enzymes and other proteins that are necessary for DNA replication and transcription.
The nucleolus is a small, dense region within the nucleus. It is responsible for the production of ribosomes. The nucleolus contains the ribosomal RNA (rRNA) that is used to make ribosomes, as well as the proteins that are necessary for ribosome assembly.
The vacuole is a large, fluid-filled organelle that is found in plant cells. It is responsible for storage, waste disposal, and cell turgor.
Therefore, the correct answer is: D. Endoplasmic Reticulum