Biology
Explore the science of life — from the molecular machinery inside cells to the patterns of inheritance that shape organisms. Develop a deep understanding of biological processes and their interconnections.
Popular Topics
1Cell Biology
Cell Structure & Organelles
Cells are the basic unit of life; all living things are made of cells.
Cell Membrane & Transport
The cell membrane is a phospholipid bilayer with embedded proteins.
Enzymes & Metabolism
Enzymes are biological catalysts — they speed up reactions without being consumed.
Cellular Respiration
Cellular respiration converts glucose + O₂ into CO₂ + H₂O + ATP.
Photosynthesis
Photosynthesis converts CO₂ + H₂O + light energy → glucose + O₂.
2Molecular Biology & Genetics
DNA Structure
DNA is a double-stranded helix made of nucleotides.
DNA Replication
DNA replication is semi-conservative: each new molecule has one old and one new strand.
Protein Synthesis (Transcription/Translation)
Transcription: DNA → mRNA in the nucleus (RNA polymerase reads template 3′→5′).
Mitosis vs Meiosis
Mitosis produces 2 genetically identical diploid cells (growth/repair).
Mendelian Genetics (Punnett Squares)
Gregor Mendel established the laws of inheritance using pea plants.