You an use other lenses too but you will loose certain features such as autofocus or 3d-lightmetering or stuff like that.
Keep in mind that you can't use all lenses on all bodies, though. AF-S lenses will work flawlessly, AF lenses will work sans-autofocus, AI/AI-S lenses will mount and that's about it (no metering), and original Nikon F-Mount pre-AI lenses will mount as well (but again, no metering here either). However, keep in mind that pre-AI lenses will NOT mount onto the D7000 or any higher level bodies, as they have an AI coupling mount to add metering ability for AI lenses, but will snap off if you attempt to mount a pre-AI lens on. So, NEVER try to mount any pre-AI lens onto a higher end body, unless you get it converted. Otherwise, it will damage the mount.