| R R R R R | letter |
| R plasmids | chapter 18 | bio 113 | heading |
| rmax | chapter 52 | bio 114 | heading |
| Radiata | chapter 32 | bio 114 | heading |
| Radiata versus bilateria | chapter 32 | bio 114 | heading |
| Radiation, adaptive | chapter 25 | bio 114 | heading |
| Random fertilization | chapter 13 | bio 113 | heading |
| Random mating | chapter 23 | bio 114 | heading |
| Range of probabilities | chapter 14 | bio 114 | heading |
| Rate, birth | chapter 52 | bio 114 | heading |
| Rate, death | chapter 52 | bio 114 | heading |
| Ratio 9:3:3:1 | chapter 14 | bio 113 | heading |
| Ratio, sex | chapter 52 | bio 114 | heading |
| Ray-finned fish | chapter 34 | bio 114 | heading |
| Reactant | chapter 2 | bio 113 | heading |
| Reaction center | chapter 10 | bio 113 | heading |
| Reaction norm | chapter 14 | bio 113 | heading |
| Reaction, Endergonic | chapter 6 | bio 113 | heading |
| Reaction, Exergonic | chapter 6 | bio 113 | heading |
| Reactions, reversible | chapter 2 | bio 113 | heading |
| Reading frame | chapter 17 | bio 113 | heading |
| Real time, evolution in | chapter 50 | bio 114 | heading |
| Realized niche | chapter 53 | bio 114 | heading |
| Rearrangement, chromosomal | chapter 15 | bio 113 | heading |
| Reception | chapter 11 | bio 113 | heading |
| Receptor-mediated endocytosis | chapter 8 | bio 113 | heading |
| Receptors, G-protein-linked | chapter 11 | bio 113 | heading |
| Receptors, tyrosine-kinase | chapter 11 | bio 113 | heading |
| Recessive alleles | chapter 14 | bio 113 | heading |
| Recessive, homozygous | chapter 14 | bio 113 | heading |
| Recessive, sex-linked affliction | chapter 15 | bio 113 | heading |
| Recessives, hidden | chapter 23 | bio 114 | heading |
| Reciprocal altruism | chapter 51 | bio 114 | heading |
| Reciprocal translocation | chapter 15 | bio 113 | heading |
| Recombinant | chapter 15 | bio 113 | heading |
| Recombinant DNA | chapter 20 | bio 113 | heading |
| Recombination | chapter 13 | bio 113 | heading |
| Recombination, frequency of | chapter 15 | bio 113 | heading |
| Recombination, genetic | chapter 15 | bio 113 | heading |
| Recombination, molecular | chapter 15 | bio 113 | heading |
| Red algae | chapter 28 | bio 114 | heading |
| Redox reactions | chapter 9 | bio 113 | heading |
| Reduced FAD | chapter 9 | bio 113 | heading |
| Reduced hybrid fertility | chapter 24 | bio 114 | heading |
| Reduced hybrid viability | chapter 24 | bio 114 | heading |
| Reduced NAD+ | chapter 9 | bio 113 | heading |
| Reducing agent | chapter 9 | bio 113 | heading |
| Reducing atmosphere | chapter 26 | bio 114 | heading |
| Reduction | chapter 9 | bio 113 | heading |
| Reduction of O2 | chapter 9 | bio 113 | heading |
| Redundancy of triplet code | chapter 17 | bio 113 | heading |
| Regeneration of NAD+ | chapter 9 | bio 113 | heading |
| Regulator, local | chapter 11 | bio 113 | heading |
| Regulator, systemic | chapter 11 | bio 113 | heading |
| Regulators | chapter 50 | bio 114 | heading |
| Regulatory gene | chapter 18 | bio 113 | heading |
| Relatedness, coefficient of | chapter 51 | bio 114 | heading |
| Relative dating | chapter 25 | bio 114 | heading |
| Relative fitness | chapter 23 | bio 114 | heading |
| Releaser | chapter 51 | bio 114 | heading |
| Relevance of microorganisms | chapter 18 | bio 113 | heading |
| Replicating haploid | chapter 13 | bio 113 | heading |
| Replication fork | chapter 16 | bio 113 | heading |
| Replication fork, a summary | chapter 16 | bio 113 | heading |
| Replication, origins of | chapter 16 | bio 113 | heading |
| Representing chemical bonds | chapter 2 | bio 113 | heading |
| Repressor | chapter 18 | bio 113 | heading |
| Reproduction | chapter 31 | bio 114 | heading |
| Reproduction isolation, behavioral | chapter 24 | bio 114 | heading |
| Reproduction, plant | chapter 29 | bio 114 | heading |
| Reproductive barriers | chapter 24 | bio 114 | heading |
| Reproductive barriers, breakdown of | chapter 24 | bio 114 | heading |
| Reproductive barriers, geographical | chapter 24 | bio 114 | heading |
| Reproductive barriers, prezygotic | chapter 24 | bio 114 | heading |
| Reproductive I.Isolation, mechanical | chapter 24 | bio 114 | heading |
| Reproductive isolation, gametic | chapter 24 | bio 114 | heading |
| Reproductive isolation, geographical | chapter 24 | bio 114 | heading |
| Reproductive isolation, habitat | chapter 24 | bio 114 | heading |
| Reproductive isolation, postzygotic | chapter 24 | bio 114 | heading |
| Reproductive isolation, selection for | chapter 24 | bio 114 | heading |
| Reproductive isolation, temporal | chapter 24 | bio 114 | heading |
| Reptilia, class | chapter 34 | bio 114 | heading |
| Resource partitioning | chapter 53 | bio 114 | heading |
| Resource, limited, allocation | chapter 52 | bio 114 | heading |
| Respiration, cellular, overview | chapter 9 | bio 113 | heading |
| Response | chapter 11 | bio 113 | heading |
| Restriction endonucleases | chapter 20 | bio 113 | term |
| Restriction enzymes | chapter 20 | bio 113 | heading |
| Restriction fragment | chapter 20 | bio 113 | heading |
| Restriction fragment length polymorphism | chapter 20 | bio 113 | heading |
| Restriction site | chapter 20 | bio 113 | heading |
| Retroviruses | chapter 18 | bio 113 | heading |
| Reverse transcriptase | chapter 18 | bio 113 | heading |
| Reverse transcription | chapter 17 | bio 113 | term |
| Reversible interactions | chapter 18 | bio 113 | heading |
| Reversible reactions | chapter 2 | bio 113 | heading |
| RFLP | chapter 20 | bio 113 | heading |
| Rhizopoda | chapter 28 | bio 114 | heading |
| Rhodophyta | chapter 28 | bio 114 | heading |
| Rhythmic behaviors | chapter 51 | bio 114 | heading |
| Ribonucleic acid | chapter 5 | bio 113 | heading |
| Ribosomal RNA | chapter 17 | bio 113 | heading |
| Ribosome A site | chapter 17 | bio 113 | heading |
| Ribosome E site | chapter 17 | bio 113 | heading |
| Ribosome P site | chapter 17 | bio 113 | heading |
| Ribosomes | chapter 7 | bio 113 | heading |
| Ribosomes | chapter 17 | bio 113 | heading |
| Ribosomes, bound | chapter 7 | bio 113 | heading |
| Ribosomes, free | chapter 7 | bio 113 | heading |
| Ring form | chapter 5 | bio 113 | heading |
| RNA | chapter 5 | bio 113 | heading |
| RNA | chapter 17 | bio 113 | heading |
| RNA polymerase | chapter 17 | bio 113 | heading |
| RNA polymerases, availability to | chapter 19 | bio 113 | heading |
| RNA priming | chapter 16 | bio 113 | heading |
| RNA world | chapter 26 | bio 114 | heading |
| RNA, messenger | chapter 17 | bio 113 | heading |
| RNA, ribosomal | chapter 17 | bio 113 | heading |
| RNA, transfer | chapter 17 | bio 113 | heading |
| Rotifera, phylum | chapter 33 | bio 114 | heading |
| Rough endoplasmic reticulum (rough ER) | chapter 7 | bio 113 | heading |
| rRNA | chapter 17 | bio 113 | heading |
| r-selected populations | chapter 52 | bio 114 | heading |
| S phase of interphase | chapter 12 | bio 113 | heading |