Tomcat does not have EJB functionality by itself,
but if you download the "JBoss with embedded Tomcat"
from this site you will have both EJB and servlet functionality.
You then need to get Apache to talk to your JBoss/Tomcat application using mod_jk plugin. This is slightly complicated but search the web for instructions.
I found it best to plug in standalone Tomcat first, then once I had this sorted, plug in both.