for 4.0.2-RC1 from my bootup logs:
08:58:23,868 INFO [Server] Release ID: JBoss [Zion] 4.0.2RC1 (build: CVSTag=JBoss_4_0_2_RC1 date=200503140913)
08:58:41,419 INFO [StandardEngine] Starting Servlet Engine: Apache Tomcat/5.5.8
Sorry cant help with any other version.
If my understanding of all this Java stuff is correct, there is no apache shipped, since a component of Tomcat called "Coyote" is the HTTP server, this is a pure Java HTTP server that runs within the JVM that JBoss sets up.