When to call raise with Ahigh

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Party Poker 10/20 Hold'em (6 max, 5 handed) converter

Preflop: Hero is SB with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, BB calls, MP calls.

Flop: (6 SB) Q[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, MP calls.

Turn: (4 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, Hero calls.

River: (8 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Hero calls.

Final Pot: 10 BB

Opponent is 45/3
AF
F 1.2
T 2.3
R 4
Under 100 hands

Is this turn and river call correct here?
What makes this a call and what board would this be an easy fold?

Thanks