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. The cell membrane controls what enters and leaves the cell, the cytoplasm is the jelly - like substance that holds organelles, and mitochondria are the powerhouses of the cell for energy production. Since the cell can't produce proteins, the malfunctioning structure is likely the ribosome.

Answer:

C. ribosome