Workflow Soluiton

I have a Drop Down List Component inside of an Update Panel Component in a Form Builder Component inside of a Dialog Workflow

If you answer the Drop Down 'Yes', two additional questions are exposed...if you answer 'No', one additional question is exposed.  All of this is working as intended.  My Question is how do I make the 2 additional questions be 'Required' when exposed and conversely the 1 additional question be 'Required' when exposed

I think you could use custom validation that checks the value of your original drop down then checks values for your additional questions. 

In the label and text box components for the 1 or 2 questions, you'll have to use the "Hide if Value is..." Custom Event. 

Check my screenshot...