text: ; Main textbook
  *  – A molecular biology textbook available free online through NCBI Bookshelf.
  :[https://www.ncbi.nlm.nih.gov/books/NBK21052/ Glossary]
  :[https://www.ncbi.nlm.nih.gov/books/NBK26864/ Ch 1: Cells and genomes]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26864/ 1.1: The Universal Features of Cells on Earth]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21068/ Ch 2: Cell Chemistry and Biosynthesis]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26883/ 2.1: The Chemical Components of a Cell]
  :[https://www.ncbi.nlm.nih.gov/books/NBK26830/ Ch 3: Proteins]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21074/ Ch 4: DNA and Chromosomes]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26821/ 4.1: The Structure and Function of DNA]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26834/ 4.2: Chromosomal DNA and Its Packaging in the Chromatin Fiber]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21064/ Ch 5: DNA Replication, Repair, and Recombination]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26850/ 5.2: DNA Replication Mechanisms]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26879/ 5.4: DNA Repair]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26898/ 5.5: General Recombination]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21050/ Ch 6: How Cells Read the Genome: From DNA to Protein]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26887/ 6.1: DNA to RNA]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26829/ 6.2: RNA to Protein]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21057/ Ch 7: Control of Gene Expression]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26885/ 7.1: An Overview of Gene Control]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26806/ 7.2: DNA-Binding Motifs in Gene Regulatory Proteins]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26872/ 7.3: How Genetic Switches Work]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26890/ 7.5: Posttranscriptional Controls]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26836/ 7.6: How Genomes Evolve]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21063/ Ch 14: Energy Conversion: Mitochondria and Chloroplasts]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26924/ 14.4: The Genetic Systems of Mitochondria and Plastids]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21065/ Ch 18: The Mechanics of Cell Division]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26931/ 18.1: An Overview of M Phase]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26934/ 18.2: Mitosis]
  :[https://www.ncbi.nlm.nih.gov/books/NBK21049/ Ch 20: Germ Cells and Fertilization]
  ::[https://www.ncbi.nlm.nih.gov/books/NBK26840/ 20.2: Meiosis]