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Theoretical A

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Theoretical A Exam + Official Answer Key Community Solutions (unofficial)
Q1 Tulip Parsimony and Morphological Characters Phylogenetic Trees & CladisticsHard IBO·2024·Q1 — ptsPDF
Q2 Strigiformes (Owls) Phylogenetic Identification Phylogenetic Trees & CladisticsHard IBO·2024·Q2 — ptsPDF
Q3 Bacterial Phylogenomics (RNA Polymerase vs Transposase) Molecular SystematicsMedium IBO·2024·Q3 — ptsPDF
Q4 Tumor Microenvironment: OCR and Extracellular pH Bioenergetics & Central Metabolism OverviewEasy IBO·2024·Q4 — ptsPDF
Q5 Antibody Mutagenesis and Cardiac Glycoside Binding (ELISA) Protein Structure, Folding & FunctionHard IBO·2024·Q5 — ptsPDF
Q6 Ramachandran Plot and Peptide Bond Geometry Protein Structure, Folding & FunctionMedium IBO·2024·Q6 — ptsPDF
Q7 Pentose Phosphate Pathway (PPP) Bioenergetics & Central Metabolism OverviewMedium IBO·2024·Q7 — ptsPDF
Q8 IGF2-H19 Imprinting and CTCF Loops Gene Regulation: Eukaryotic & EpigeneticsHard IBO·2024·Q8 — ptsPDF
Q9 ATAD1 Mitochondrial ATPase (Cryo-EM Study) Protein Structure, Folding & FunctionHard IBO·2024·Q9 — ptsPDF
Q10 Magnetotactic Bacteria Navigation Cell Theory, Prokaryotes & EukaryotesHard IBO·2024·Q10 — ptsPDF
Q11 Directed Evolution of Enzyme D (NADH-Dependent) Recombinant DNA & Biotechnology TechniquesEasy IBO·2024·Q11 — ptsPDF
Q12 DMSO₄ Poisoning Case Study Plasma Membrane Structure & TransportMedium IBO·2024·Q12 — ptsPDF
Q13 Nitrogen Limitation of Legumes in Steppes EcologyMedium IBO·2024·Q13 — ptsPDF
Q14 Latitudinal Diversity Gradient: Three Hypotheses EcologyHard IBO·2024·Q14 — ptsPDF
Q15 ENSO and Ecosystem Effects EcologyHard IBO·2024·Q15 — ptsPDF
Q16 Fractal Geometry and Scale-Dependent Resource Availability EcologyHard IBO·2024·Q16 — ptsPDF
Q17 Water Scarcity Index (Rws) and Solutions EcologyMedium IBO·2024·Q17 — ptsPDF
Q18 Animal Road Barrier Effect (Traffic Behavior Types) Mechanisms of BehaviorMedium IBO·2024·Q18 — ptsPDF
Q19 Cumulative Cultural Evolution in Rock Pigeons Development & LearningHard IBO·2024·Q19 — ptsPDF
Q20 Haploid/Diploid Organisms and Multi-Allele Genetics Mendel's Laws & Probability in GeneticsMedium IBO·2024·Q20 — ptsPDF
Q21 Out-of-Africa Human Genetic Diversity and Effective Population Size Genetic Drift, Gene Flow & Mutation Human Evolution & Hominid PhylogenyMedium IBO·2024·Q21 — ptsPDF
Q22 ADH1B Allele Geography and Ethanol Metabolism Natural Selection: Modes & FitnessMedium IBO·2024·Q22 — ptsPDF
Q23 Drosophila Allele Frequency Experiment and Stabilizing Selection Natural Selection: Modes & Fitness Population Genetics & Hardy-Weinberg EquilibriumMedium IBO·2024·Q23 — ptsPDF
Q24 Codon Usage Bias Translation & the Genetic CodeEasy IBO·2024·Q24 — ptsPDF
Q25 Mitochondrial RNase P Mutations and COXPD54 Pedigree Analysis & Human Genetic Disorders Mitochondria & Chloroplasts: Structure & Endosymbiotic OriginHard IBO·2024·Q25 — ptsPDF
Q26 Mass Extinctions and Carbon Cycle Perturbations Macroevolutionary Patterns & Mass ExtinctionsHard IBO·2024·Q26 — ptsPDF
Q27 Beta-Lactamase Mutational Trajectories and Epistasis Gene Interactions: Epistasis & Complementation AnalysisHard IBO·2024·Q27 — ptsPDF
Q28 Distribution of Fitness Effects and Effective Population Size Genetic Drift, Gene Flow & MutationHard IBO·2024·Q28 — ptsPDF
Q29 Endogenous Retroviruses and Retrotransposons DNA Repair & RecombinationMedium IBO·2024·Q29 — ptsPDF
Q30 Gibberellin Transport and Root Endodermis Suberization Plant Hormones Root AnatomyHard IBO·2024·Q30 — ptsPDF
Q31 Photorespiration Pathway Calvin Cycle, Photorespiration & C4/CAM BiochemistryMedium IBO·2024·Q31 — ptsPDF
Q32 Poaceae Stomata Synchronization Mechanism Stomatal Physiology & Gas ExchangeHard IBO·2024·Q32 — ptsPDF
Q33 Xanthophyll Cycle and Photoprotection Light Reactions & PhotophosphorylationMedium IBO·2024·Q33 — ptsPDF
Q34 Maize Leaf Carbohydrate Allocation Phloem Transport & TranslocationMedium IBO·2024·Q34 — ptsPDF
Q35 Sequoia Tree Water Use Strategies Water Transport & TranspirationHard IBO·2024·Q35 — ptsPDF
Q36 Aquatic Carbon Uptake Calvin Cycle, Photorespiration & C4/CAM BiochemistryMedium IBO·2024·Q36 — ptsPDF
Q37 Root Water Movement and Osmotic Regulation Root AnatomyMedium IBO·2024·Q37 — ptsPDF
Q38 ECG Interpretation Cardiovascular PhysiologyHard IBO·2024·Q38 — ptsPDF
Q39 Snow Leopard Hemoglobin at High Altitude Respiratory PhysiologyMedium IBO·2024·Q39 — ptsPDF
Q40 Circadian Misalignment in Mice Biological RhythmsMedium IBO·2024·Q40 — ptsPDF
Q41 Octopus Active Sleep and Circadian Control Biological RhythmsMedium IBO·2024·Q41 — ptsPDF
Q42 Electric Eel Prey Detection Foraging & Anti-Predator BehaviorMedium IBO·2024·Q42 — ptsPDF
Q43 Saiga Nasal Anatomy and Wolf Predation Mammalian Comparative Anatomy Foraging & Anti-Predator BehaviorHard IBO·2024·Q43 — ptsPDF
Q44 TLR7/8 Activation in Sperm Sex Sorting Reproductive PhysiologyEasy IBO·2024·Q44 — ptsPDF
Q45 Vascularized Cardiac Tissue In Vitro Cardiovascular PhysiologyMedium IBO·2024·Q45 — ptsPDF
Q46 Channelrhodopsin-2 (ChR2) in Hippocampal Neurons Nervous System PhysiologyHard IBO·2024·Q46 — ptsPDF
Q47 Cost of Transport in Locomotion Locomotion & EnergeticsHard IBO·2024·Q47 — ptsPDF
Q48 Helium Dilution Test for Residual Volume Respiratory PhysiologyHard IBO·2024·Q48 — ptsPDF
Q49 Esophageal Doppler Monitoring Cardiovascular PhysiologyHard IBO·2024·Q49 — ptsPDF
Q50 Countercurrent System and Nephron Function Comparative Osmoregulation & ExcretionMedium IBO·2024·Q50 — ptsPDF