Make a range of cells mandatory if one cell is filled in as NO

[Moseth]

currently I have the code where I am making one cell mandatory when one cell is filled in as yes or no. I want an easier way to specify more than one cell to be mandatory when a certain cell is filled in as no

code at the moment to make one cell mandatory
'Mandatory Dependant Questions
If Application.Sheets("WERS ALERT SHEET V15").Range("C16").Value = "Yes" And _
Application.Sheets("WERS ALERT SHEET V15").Range("K16").Value = "" Then
Cancel = True