by 
paddywack
ANSWERS: 2
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Yes, you can do that but it is recommended that you use some sort of backerboard or wire lath. As long as the floor is flat you should be ok. Otherwise you will have a very wavy floor. If you choose to not use backerboard then make sure you have the right type of thinset for maximum adheashion to the floor. The Backerboard is added protection for when the floor gets extremely wet. With out it the floor is sure to come up once the water makes its way to the wood subfloor.
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No you cannot. You must have a good solid, unflexing subfloor and then some sort of CBU (Cement backerboard) which gets a layer of thinset underneath it or something like Ditra. And the subfloor cannot be on real wood. It must be a plywood or OSB. If the floor is not solid and has any flex in it, when weight is applied the tiles and grout will crack, maybe sooner rather than later, especially for the more natural materials like stone, terra cotta, or marble. The CBU does NOTHING for water resistance or rigidity. It is there for good surface preparation and adhesion of the tiles. To find out what thickness floor you need, check out the Deflectolator (a great calculator for figuring out your deflection of your floors) at: http://www.johnbridge.com/vbulletin/deflecto.pl
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