WAKE TURB FROM B747 INJURES A CABIN ATTENDANT ON B737 DURING A STAR ARR INTO LAX.

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WE WERE ON THE SADDE 6 ARR INTO LAX WHEN ATC STARTED GIVING US VECTORS AROUND THE COURSE FOR SEPARATION. I WAS THE PF; AND DID NOT SEE ANYONE OUT IN FRONT OF US; BUT DID SEE A TARGET ROUGHLY 8 MI AHEAD OF US ON TCASII. WE WERE NEVER ADVISED THAT IT WAS A HVY JET. WE HAD SEATED THE PAX; BUT THE FLT ATTENDANTS WERE UP WHEN WE HIT THE B747'S WAKE TURB. THE CAPT IMMEDIATELY CONTACTED THE CABIN TO MAKE SURE EVERYONE WAS ALRIGHT WHILE I CONTACTED ATC TO FIND OUT WHAT TYPE ACFT WE WERE FOLLOWING. THE FLT ATTENDANTS RPTED THAT EVERYTHING IN THE CABIN WAS OK EXCEPT FOR 2 SEAT CUSHIONS WHICH HAD SPILLED TOMATO JUICE ALL OVER THEM. WHEN I QUESTIONED ATC AS TO WHO WE WERE FOLLOWING; THE CTR CTLR WAS EXTREMELY RUDE AND MADE ME REPEAT MY QUESTION 3 TIMES BEFORE TELLING US IT WAS A HVY JET. I BELIEVE THAT HE HAD LOST SEPARATION AND WAS AVOIDING STATING THAT FACT. ON THE GND; OUR PURSER COMPLAINED OF NECK PAIN AND WAS ULTIMATELY REMOVED FROM THE TRIP. I BELIEVE THAT IF THE CTLR HAD INITIALLY TOLD US WE WERE FOLLOWING A HVY; I WOULD HAVE BEEN ABLE TO ADJUST MY FLT PATH ON THE DSCNT TO AVOID THIS SIT. THANKFULLY; WE DID NOT HAVE ANY PAX STANDING; AS I THINK MORE PEOPLE WOULD HAVE BEEN INJURED DURING THIS INCIDENT.