A crystal microphone uses

A catalytic converter:

Nucleic acids are found in all living organisms, from viruses to man. They received their name because of their discovery in the nuclei of white blood cells and fish sperm by Swiss physiologist Johann Mescher in
1869. However, it is now well established that nucleic acids occur outside the cell nucleus as well.
Nucleic acids are found

Cell protoplasm is made up mostly of:

Heather's rapport with her superiors and coworkers was really something to see.