First, when posting a hand for analysis, leave the results out so that they don't skew people's viewpoints. It's a lot easier to see that you lost the pot and for us to go "Well, that's a snap fold!" than if you were to leave out the result so we can analyze it.

As everyone mentioned above, being check-raised when we're in position, or being raised when we're out of position usually indicates a very strong holding. Obviously it depends on the villian and the flop texture, but you're likely to be behind if you only hold a pair. There is a theorem that specifically addresses this situation:, google the "Baluga Theorem". (I tried to provide a link just now but FTR hates me because I have less than 10 posts).

To sum it up, villians at these levels aren't sophisticated enough to semi-bluff draws or get tricky. If you're being played back on the turn and you have one pair, you can safely fold if you're not pot committed to the hand.