Final answer:
The ribosome is the cell structure most likely malfunctioning in a diseased cell that cannot produce proteins.
Step-by-step explanation:
The cell structure most likely malfunctioning in a diseased cell that is no longer able to produce proteins is the ribosome. Ribosomes are responsible for protein synthesis, and if they are not functioning properly, the cell will be unable to produce proteins. Proteins are essential for various cellular processes and functions, and their absence can lead to significant disruptions in cell function.
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