Complete 24-Hour High School Biology Masterclass

Explore cell theory, prokaryotic vs. eukaryotic cells, and plant versus animal organelles, linking structure to function. Learn how viruses replicate and how microscopes reveal cellular details.

Examine the biological roles of carbohydrates, lipids, proteins, and nucleic acids, and analyze how weak interactions shape cell membranes, cell walls, and energy transfer.

Explore protein structure from primary sequences to quaternary assemblies, and learn bonding types, including hydrogen, ionic, disulfide, and hydrophobic interactions that shape enzymes, antibodies, and collagen.

Explore enzyme structure and function in metabolism, including lock-and-key and induced-fit models, activation energy, inhibitors, cofactors, and coenzymes.

Watch a live mock IMAT biology test walkthrough, learn exam tactics for shade-only answers, and review key topics like enzymes, cell theory, and DNA.

Explore the fluid mosaic model of cell membranes, detailing phospholipid bilayers, cholesterol, membrane proteins, glycoproteins and glycolipids, and their roles in transport, signaling, and cell recognition.

Explore how cells transport across membranes through diffusion, facilitated diffusion, osmosis, and active transport. Learn about endocytosis, exocytosis, and the basics of cell signaling with ligands, receptors, and secondary messengers.

Discover how chromosomes coil DNA into chromatin and nucleosomes, then undergo mitosis, covering cell cycle phases, DNA replication, telomeres, cancer and telomerase.

Learn DNA structure and replication, RNA transcription and translation, and how mutations alter proteins. Then uncover meiosis, crossing over, independent assortment, and the basics of spermatogenesis and oogenesis.

Master Mendelian genetics, Punnett squares, and inheritance patterns from dominance to codominance, including sex-linked traits and disease examples like sickle cell and albinism.

Explore X-linked and autosomal disorders and master gene control and regulation, from lac operon mechanics in prokaryotes to transcription factors and epigenetic regulation in eukaryotes.

Explore genetic variation from meiosis, mutation, and fertilization, then continuous vs discontinuous variation and stabilizing, directional, and disruptive selection shaping adaptation.

Master the Hardy-Weinberg equation and allele frequencies p and q, with p^2, 2pq, and q^2 for genotypes. Explore genetic drift, bottleneck effects, and artificial selection in crops and livestock.

Explore the theory of evolution and how speciation occurs through allopatric, sympatric, and parapatric barriers, driven by reproductive isolation and genetic divergence revealed by mtDNA and amino acid sequences.

Explore extinction drivers such as climate change, habitat loss, competition, and species introductions, and discover bioenergetics basics like photosynthesis and ATP production.

Explore how mitochondria generate ATP through glycolysis, the link reaction, the Krebs cycle, and oxidative phosphorylation, detailing inner and outer membranes, cristae, and the electron transport chain.

Trace aerobic respiration from glycolysis to oxidative phosphorylation, detailing acetyl coenzyme A formation, the Krebs cycle, and ATP production. Then compare anaerobic pathways, including ethanol and lactate fermentation.

Explore how homeostasis maintains internal conditions through the excretory system, detailing kidneys, nephrons, ultrafiltration, reabsorption, loop of Henle, and waste products like urea and uric acid.

Examine osmoregulation via loop of Henle and ADH signaling to concentrate urine, and explain blood glucose control by insulin, glucagon, and Islets of Langerhans.

Discover how the nervous system coordinates function through central and peripheral components, sensory, relay, and motor neurons, and rapid reflex arcs via myelin-assisted saltatory conduction.

Explore the structure of skeletal, cardiac, and smooth muscles, the sliding filament mechanism, neuromuscular transmission, calcium triggers, cross-bridges, and fast versus slow muscle fibers.

This lecture introduces the mammalian circulatory system, detailing the closed double circulation and the heart, lungs, body, blood vessels, and components like red and white blood cells and platelets.