Question

which structure synthesizes proteins that will be used by the cell?
nuclear pore
chromatin
nucleolus
endoplasmic reticulum
ribosome
chromatin
nucleolus
ribosome
endoplasmic reticulum

Explanation:

• Chromatin: Composed of DNA and proteins, it is involved in packaging DNA, not protein synthesis.
• Nucleolus: Involved in ribosome synthesis, not direct protein synthesis for cell use.
• Ribosome: The site of protein synthesis. It reads mRNA and assembles amino acids into proteins that the cell can use.
• Endoplasmic reticulum (ER): While the rough ER (with ribosomes) is involved in protein synthesis (for secretion or membrane - bound proteins), the question asks for proteins used by the cell. Free - floating ribosomes (not attached to ER) synthesize proteins for intracellular use.

Answer:

ribosome