IB Biology Topic 1 Videos

This video explores the atomic structure of water, explaining its polarity, hydrogen bonding, and interactions with hydrophilic and hydrophobic molecules.

This video discusses the cohesive, adhesive, thermal, and solvent properties of water, illustrating their biological significance in organisms and ecosystems.

This video compares water and air in terms of physical properties like buoyancy and viscosity, analyzing their impact on aquatic species such as loons and ringed seals.

This video explores the origins of Earth’s water, focusing on the asteroid theory, isotope evidence, and the significance of water in the search for extraterrestrial life.

This video introduces the structure and function of DNA and RNA, highlighting nucleotide composition, complementary base pairing, and the experiments that uncovered the double helix.

This video covers key discoveries in DNA structure, including Hershey and Chase’s experiment, Chargaff’s rules, and the role of nucleosomes in eukaryotic DNA packaging.

This video covers the structures and functions of carbohydrates, including monosaccharides, disaccharides, polysaccharides, and glycoproteins, with examples of biological roles.

This video explains the structure and types of lipids, focusing on triglycerides, phospholipids, and steroids, and their roles in energy storage, insulation, and membrane formation.

This video introduces the structure and functions of proteins, covering amino acids, polypeptides, and the factors influencing protein activity, such as temperature and pH.

This video explains protein folding, the role of R-groups, and the four levels of protein structure, using examples like insulin, collagen, and haemoglobin.

This video explains metabolism, the role of enzymes in lowering activation energy, and the industrial use of immobilized enzymes, such as in lactose-free milk production.

This video details how enzymes catalyze reactions, covering substrate binding, the induced fit model, and the effects of temperature, pH, and substrate concentration on enzyme activity.

This video introduces metabolic pathways, differentiating between cycles and chains, and explains the role of heat generation in metabolism and thermoregulation.

This video discusses competitive and non-competitive enzyme inhibition, their effects on reaction rates, and the example of statins as competitive inhibitors.

This video explores mechanism-based inhibition, using penicillin as an example, and explains end-product inhibition in metabolic regulation.

This video explores ATP as the energy currency of cells, comparing aerobic and anaerobic respiration and their applications in humans and yeast.

This video examines factors affecting respiration rates, such as temperature and oxygen, and introduces respirometers as tools for measuring respiration ethically.

This video introduces aerobic and anaerobic respiration, explaining glycolysis, oxidation-reduction reactions, and ATP production.

This video details the link reaction and Krebs cycle, showing how pyruvate is processed into acetyl-CoA and used for energy production, including lipid metabolism.

This video explains oxidative phosphorylation, the electron transport chain, and chemiosmosis, highlighting ATP synthesis in aerobic respiration.

This video explores photosynthesis, its factors, and the role of carbon dioxide enrichment in understanding plant growth and climate change impacts.

This video discusses chlorophyll’s role in photosynthesis, absorption and action spectra, and the use of chromatography to identify leaf pigments.

This video explores the light-dependent reactions of photosynthesis, including photolysis, photophosphorylation, and electron transport chains, leading to ATP and NADPH production.

This video explains the Calvin cycle, detailing carbon fixation by rubisco, the production of triose phosphate, and the regeneration of ribulose bisphosphate.

This video explains DNA replication, semi-conservative replication, and DNA profiling through PCR and gel electrophoresis.

This video covers the mechanisms of DNA replication, including the roles of enzymes such as DNA polymerase, ligase, and helicase, and the proofreading processes that prevent mutations.

This video covers transcription, the process of mRNA synthesis from DNA, and introduces codons and the genetic code’s universality.

This video explains translation, tRNA’s role in protein synthesis, and the genetic mutation causing sickle cell anaemia.

This video introduces gene expression, focusing on non-coding DNA, transcription regulators, and differences in transcription initiation between prokaryotes and eukaryotes.

This video explains transcription, mRNA processing, and post-transcriptional modifications such as capping, polyadenylation, and splicing.

This video covers the transport of mRNA, the role of ribosomes and tRNA, and the stages of translation—initiation, elongation, and termination.

This video explores polypeptide activation, amino acid recycling, and the role of proteasomes in protein degradation.

This video explores DNA mutations, including substitution and frameshift types, and the impact of mutagens like radiation and chemicals.

This video introduces gene knockout techniques, focusing on CRISPR-Cas9, its applications in genetic research and medicine, and ethical concerns surrounding human germline editing.