Is cheaper Cat fooD Better ?

Topic: Cat Food and its fundamentals
Thesis:
I want to know what cat food is made up of.. where it comes from and how healthy it is for my cat
Other Questions I have :
1)If I Buy cheaper cat food is it better or worse ?
2)Is cat food processed like human food?
3)does the meat in the wet food have antibiotics ?
4)If you are looking for answers too, you can find more information at
http://www.consumersearch.com/cat-food to find the rates of different types of cat food
http://cats.about.com/cs/catfood/a/ingredients.htm to learn about the ingredients it should havehttp://www.consumerreports.org/health/healthy-living/health-safety/pet-food/overview/pet-food-ov.htm
and http://www.catinfo.org/commercialcannedfoods.htm