Retention of common nucleotide sequences in the ribosomal deoxyribonucleic acid of eukaryotes and some of their physical characteristics.

Amphibians Animals Anura Base Sequence Biological Evolution Birds Centrifugation, Density Gradient Cytosine Nucleotides/analysis DNA/analysis DNA, Bacterial DNA, Viral Fishes Fungi Genes Guanine Nucleotides/analysis Humans Insecta Invertebrates Myxomycetes Nucleic Acid Hybridization Nucleotides/analysis Plants RNA, Ribosomal Ribosomes Tritium Ultracentrifugation Vertebrates

Cytosine Nucleotides DNA, Bacterial DNA, Viral Guanine Nucleotides Nucleotides RNA, Ribosomal Tritium DNA