Yes. It's always good to have such items around when dealing with SCSI.
That one's also good:
http://www.ebay.com/itm/24-50-Pin-SCSI3-Connector-Internal-Ribbon-Cable-Up-2-Drives-w-Terminator-/280758162233?pt=LH_DefaultDomain_0&hash=item415e7d9339
Yes, if that particular Apple CD-ROM drive model has onboard termination.