Each medical term built from word parts contains one or more:

Each medical term built from word parts contains one or more word roots.  A medical term that is formed from the first letters of the words in a phrase, can be spoken as a whole word, and usually contains a vowel is an acronym. 

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).