"The cell membrane is the same as a computer chip with individual receptors as the keys on the keyboard. The cell nucleus is like the hard drive that contains the software. If you remove the floppy disk that installed the program, the computer still works and you can select which software program you want to use at the moment."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database