Need help on nikon cameras

For nikon cameras, can you put the same lens on all different DSLR cameras? Like i have a 70-300mm lens. Can I put that same lens on a nikno D300, D3100 or D90?

If so, does that mean that the same 2x teleconverters can be used for any nikon DSLR?

The 70-300mm will fit on Nikon's entire dslr range.

EXCLUSIONS:
You may run into problems if the lens is a older F mount type like some AI or AF lenses… You will lose the autofocus feature. But the lens should still operate as normal (expect for autofocus)

additional resource on lens compability
http://www.nikonians.org/html/resources/nikon_articles/other/compatibility.html

TELECONVERTERS:
Teleconverters are not compatable with all lens. Teleconverter are designed for their high end lenses like the 70-200mm or their tele primes like 300mm or 400mm primes.
It is not compatable with the 70-300mm

here is nikon's official teleconverter compability pdf
http://www.nikonsupport.eu/europe/Manuals/DrdIaQvRZv/TC_converter_compatibility-EN_01.pdf