Muscle cells differ from nerve cells mainly because they

a. express different genes.

b. contain different genes.

c. use different genetic codes.

d. have unique ribosomes.

Answer: a. express different genes.

Explanation:

The nerve cells is functional for controlling the coordination of the body, respond to the external stimuli, voluntary actions in the body. The muscle cells contract and relax to facilitate the locomotion.

All the somatic cells of a living being have the same genomic make up. However, completely differentiated cells of particular tissue lineages express distinct genes, as required so as to perform specialized functions in the body.