Second semester biochemistry may be my favorite science class after organic. We had to learn every step, enzyme, cofactor, mechanism, ect. in all of the metabolic pathways. I could literally draw mechanistic steps to go from glucose to nearly any common metabolic molecule (i.e., FA's, AA's, other sugars, etc.).
My professor also included some cool sections on our exam that we hadn't actually covered in class, but which we were expected to be able to interpret and answer questions about. It was similar to the MCAT.
Definitely take it! It makes sense of the metabolic steps that you have probably been forced to memorize throughout your undergraduate career without ever understanding why the molecules progressed the way that they did through the cycles.