KK second hand, scary flop ($27)

This is second hand, no reads. What to do on the turn? If I call the bet, what do I do on the river?

Poker Stars No Limit Holdem Tournament
Blinds: t10/t20
9 players
Converter

Stack sizes:
UTG: t1650
Hero: t1500
MP1: t1480
MP2: t1480
MP3: t1500
CO: t1420
Button: t1490
SB: t1480
BB: t1500

Pre-flop: (9 players) Hero is UTG+1 with K K
UTG folds, Hero raises to t80, 2 folds, MP3 calls t80 (pot was t110), CO calls t80 (pot was t190), 3 folds.

Flop: Q J A (t270, 3 players)
Hero checks, MP3 checks, CO checks.

Turn: 9 (t270, 3 players)
Hero checks, MP3 checks, CO bets t100, Hero ????

Smells like JT/QT

Peel because folding is for quitters.

Call, its probably Qx (KQ, QT)

OK, so I called the turn. What about the river?

Turn: 9 (t270, 3 players)
Hero checks, MP3 checks, CO bets t100, Hero calls t100 (pot was t370), MP3 folds.

River: 5 (t470, 2 players)
Hero checks, CO bets t200, Hero ????

Hero calls

Fold, he's got an Ace.

I think Qx is more likely

I would call too, I believe he wouldn't check behind with an Ace on the flop.. but folding is fine too.. this is pretty close so doesn't matter IMO..