It's a good thing that Jason Tarver mastered (as in degree) biochemistry and molecular biology. Because he is taking on much uglier, more complicated material now.

How are the Raiders going to stop the run?

And when he's done with that decade-old problem, Oakland's bright-eyed new defensive coordinator can tackle this brainteaser:

How are the Raiders going to stop the pass?

Oakland, which won eight games last season on the strength of its offense, became one of four teams to allow at least 30 TD passes and 5.0 yards per carry in a season. (Not to mention the entire squad's NFL-record 163 penalties for 1,358 yards.) The Raiders had a lot of high-priced players, but few, if any, playmakers on defense.

And then, in the offseason, Oakland cut leading pass-rusher Kamerion Wimbley for salary-cap reasons and also let go of its two starting cornerbacks, Stanford Routt and Chris Johnson.

The Raiders replaced them with several veterans signed to one-year contracts and rookies drafted after the second round, as they didn't have any early picks.

All of which explains why Tarver can't go into a lot of detail when asked what the Raiders' defense is going to look like. He doesn't know yet.

The team was back on the field for organized workouts Monday, Tuesday and Wednesday, and Tarver and new head coach Dennis Allen are still in discovery mode.

"Put all these guys out here and see who can play and who can learn and who can communicate and who can fit with your group," Tarver said.

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Raiders' professor of defense