Cells with a high rate of protein synthesis generally have a large number of:

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Ribosomes are responsible for protein synthesis. Ribosomes read RNA produced in the nucleus and translate the genetic instructions provided to produce proteins. Cells with a high rate of protein synthesis typically contain a high number of ribosomes.
The mitochondrion is the powerhouse of most eukaryotic cells and is the site of cellular respiration.
Lysosomes are the digestive system of the cell. Lysosomes contain hydrolytic enzymes which allow them to hydrolyze (break down) proteins, fats, sugars, and nucleic acids taken into the cell as well as break down other worn out organelles within the cell. Lysosomes contain an acidic environment with a pH of around 4.5.
Vacuoles provide storage for the cell. Vacuoles are membrane-enclosed structures that have a variety of functions depending on cell type. Many cells uptake food through the cell membrane (this process is called phagocytosis), creating a food vacuole. Plant cells have a central vacuole that functions as storage, waste disposal, protection, and hydrolysis.

Cells with a High Rate of Protein Synthesis Generally Have