[BioC] GO analysis code snippet

[Simon Lin]

Hello,

I am looking for some GO analysis code-snippet for the following task,

1) list all the GO terms under "molecular function"
2) For a given GO id, list the associated Entrez gene IDs (or Affymetrix 
probe IDs for U133A)

A further question: is there a package analyzeing GO hierarchically? I mean, 
testing the parent nodes first; if it is not significant, then, testing the 
children? I think most of the packages just test all the GO terms 
simutanuously.

Thanks!

Simon