Question

a diseased cell is no longer able to produce proteins. which cell structure is most likely malfunctioning? cell membrane cytoplasm ribosome mitochondrion

Explanation:

Ribosomes are the sites of protein - synthesis in the cell. If a cell can't produce proteins, the ribosome is most likely malfunctioning. Mitochondria are for energy - production, cytoplasm is the fluid part of the cell containing organelles, and the cell membrane is for protection and regulating transport.

Answer:

ribosome