yuck. Frozen meat has a different texture and is not a substitute except in emergencies. Though if you are not for cooking yourself you probably have enough other bad things happening in your food chain that you cannot tell the difference.
This depends on how the meat is frozen. Frozen meat can be more fresh in texture than chilled meat when flash frozen and dethawed immediately before use. The process of slowly freezing food alters the chemical structure, while flash freezing maintains this structure and subsequently the mouth feel and flavor of fresh meat/produce.
To those questioning the benefit of rote memorization of API signatures and other factoids that are always just a click or hover away: would you say the same about vocabulary words when learning a new human language?