Final answer:
The correct answer is 30nm; greater compaction. In the 30nm fiber, histone H1 is more abundant and plays a greater role in compacting the DNA, resulting in lower levels of H1.
Step-by-step explanation:
The correct answer is b) 30nm; greater compaction.
Chromatin, the substance that makes up chromosomes, can exist in two different forms: euchromatin and heterochromatin. Euchromatin is less compacted and has more accessible DNA, while heterochromatin is highly compacted. H1 is a histone protein that helps in the compaction of DNA. In the 30nm fiber, histone H1 is more abundant and plays a greater role in compacting the DNA, resulting in lower levels of H1.