Final answer:
Histone H1 is not retained in the classic "beads-on-a-string" structure, while the other four histones are retained.
Step-by-step explanation:
When the classic "beads-on-a-string" structure is generated, histone H1 is not retained. The other four chromatin components, histone H2A, histone H2B, histone H3, and histone H4, are retained.