What is the term for a long, self-contained unit of a larger work?

Which piano accompaniment style did Count Basie pioneer?

a. Stride style b. Locked hands style c. Comping d. Boogie-woogie

Bernward's doors for Saint Michael's, Hildesheim, juxtapose scenes from Genesis with scenes from ____

a. the Gospel of Luke b. Exodus c. the prodigal son d. the life of Christ