What is a negative consequence of using a euphemism?

Euphemism is the method of describing in a polite and agreeable manner something that is harsh, rude or offensive. There are positive and negative euphemism. One negative consequence of using euphemism is that it reduces the level of transparency. 

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.