Final answer:
Ribosomes are the cell structures responsible for protein synthesis and would likely be malfunctioning in a cell unable to produce proteins.
Explanation:
The ribosome is the cell structure most likely malfunctioning if a diseased cell is unable to produce proteins. Ribosomes are responsible for protein synthesis in cells, receiving instructions from mRNA transcribed in the nucleus and translating them into specific amino acid sequences that form proteins.
Ribosomes can be found floating freely in the cytoplasm or attached to the endoplasmic reticulum, playing a critical role in ensuring protein production within the cell.
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