Compare and contrast the following pairs of terms: Purine / Pyrimidine: Ribose / Deoxyribose: Histones / Nucleosomes:

Purine / Pyrimidine: Purine - Larger, double-ring structure. Pyrimidine - Smaller, single-ring structure. Both are types of nitrogenous bases in DNA and RNA. Ribose / Deoxyribose: Ribose - Sugar in RNA, has an extra oxygen. Deoxyribose - Sugar in DNA, lacks one oxygen compared to ribose. Both are part of the nucleotide structure. Histones / Nucleosomes: Histones - Proteins that help DNA coil and pack. Nucleosomes - DNA wrapped around histones. Both involved in DNA compaction and organization in the cell.