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 fluid part of the cell where many metabolic reactions occur, and mitochondria are the power - houses of the cell that produce energy. Since the cell can't produce proteins, the malfunctioning structure is likely the ribosome.

Answer:

C. ribosome