Final answer:
The most likely malfunctioning cell structure in a diseased cell that is unable to produce proteins is the ribosome.
Step-by-step explanation:
When a diseased cell is no longer able to produce proteins, the cell structure that is most likely malfunctioning is the ribosome. Ribosomes are responsible for protein synthesis, where they read the mRNA sequence and help assemble amino acids into proteins. If the ribosomes are not functioning properly, the cell will not be able to produce proteins.
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