[PyMOL] Selection of DNA backbone or base pairs

[James Puckett]

I am trying to color the DNA backbone and DNA base pairs uniquely en  
masse for several crystal / NMR structures.  Is there a simple way to  
select solely the DNA phosphate backbone or solely the DNA bases or  
DNA bases + sugars, etc?  I know how to select atoms individually,  
but am wondering if there is either a) a script available for this  
task or b) a selection logic that would render this task far easier.

Thanks,
Jim Puckett