It is possible to use in-line markup to style your questions.
It is very easy to add bold and italic styling to your text;
To make a word or collection of words bold, surround it like this; **your word**.
To make a word or collection of words italic, surround it like this; *your word*.
In the image below, you can see on the left how the text will appear for the respondent and on the right how the input text will look for you when creating and editing questions.