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Theoretical 1

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Questions 4 and 9 were officially deleted by IBO and are not included.

Theoretical 1 Exam + Official Answer Key & Solutions
Q1 Skeletal Muscle Energy Sources Muscle PhysiologyMedium IBO·2023·Q1 — ptsPDF
Q2 Smooth Muscle Contraction Dynamics Muscle PhysiologyMedium IBO·2023·Q2 — ptsPDF
Q3 Flow Cytometry of Mouse Blood Biomolecular Analytical Techniques Immune PhysiologyMedium IBO·2023·Q3 — ptsPDF
Q5 Desert March Dehydration and SIADH Homeostasis & Osmoregulation Cardiovascular PhysiologyHard IBO·2023·Q5 — ptsPDF
Q6 Renal Clearance and Glomerular Filtration Comparative Osmoregulation & ExcretionHard IBO·2023·Q6 — ptsPDF
Q7 Archaeal Phylogeny and the Origin of Eukaryotes History of Life: Origin & Major Transitions Cell Theory, Prokaryotes & EukaryotesHard IBO·2023·Q7 — ptsPDF
Q8 Gram Staining, Monoderms, Diderms and Firmicute Evolution Cell Theory, Prokaryotes & Eukaryotes Phylogenetic Trees & CladisticsHard IBO·2023·Q8 — ptsPDF
Q10 Yeast Prion [GAR+] and Bacterial Metabolite Signaling Gene Regulation: Eukaryotic & EpigeneticsHard IBO·2023·Q10 — ptsPDF
Q11 Engineered Viral Capsids and Genome Packaging Recombinant DNA & Biotechnology Techniques Protein Structure, Folding & FunctionHard IBO·2023·Q11 — ptsPDF
Q12 Genome Size, Genetic Code and Alien DNA Nucleotide & Nucleic Acid Chemistry Translation & the Genetic CodeHard IBO·2023·Q12 — ptsPDF
Q13 Bacterial 23S rRNA Gene Copy Number Nucleotide & Nucleic Acid ChemistryMedium IBO·2023·Q13 — ptsPDF
Q14 DNA Replication Origins and Rate DNA Structure & ReplicationMedium IBO·2023·Q14 — ptsPDF
Q15 Sea Turtle Temperature-Dependent Sex Determination Sex Determination & Sex-Linked Inheritance EcologyMedium IBO·2023·Q15 — ptsPDF
Q16 Metabolic Scaling and Kleiber's Law Comparative Thermoregulation Locomotion & EnergeticsMedium IBO·2023·Q16 — ptsPDF
Q17 Community Similarity: Sorensen-Dice and Jaccard EcologyMedium IBO·2023·Q17 — ptsPDF
Q18 Ecosystem Tipping Points and Vegetation-Livestock Dynamics EcologyHard IBO·2023·Q18 — ptsPDF
Q19 Foraging Energetics and Territory Defence Foraging & Anti-Predator Behavior Aggression, Territoriality & Social StructureMedium IBO·2023·Q19 — ptsPDF
Q20 Flycatcher Song Dialects and Species Discrimination Animal CommunicationHard IBO·2023·Q20 — ptsPDF
Q21 Guppy Mate-Choice Copying Mating Systems & Sexual SelectionHard IBO·2023·Q21 — ptsPDF
Q22 Mendel's Round and Wrinkled Peas: PCR Analysis Mendel's Laws & Probability in Genetics Recombinant DNA & Biotechnology TechniquesMedium IBO·2023·Q22 — ptsPDF
Q23 Genomic Imprinting Pedigree Pedigree Analysis & Human Genetic Disorders Gene Regulation: Eukaryotic & EpigeneticsHard IBO·2023·Q23 — ptsPDF
Q24 Identical-by-Descent Segments and Genetic Relatedness Population Genetics & Hardy-Weinberg EquilibriumHard IBO·2023·Q24 — ptsPDF
Q25 Nucleotide Diversity and Selective Sweeps Population Genetics & Hardy-Weinberg Equilibrium Natural Selection: Modes & FitnessHard IBO·2023·Q25 — ptsPDF
Q26 Transgenic Male Sterility and Herbicide Resistance Mendel's Laws & Probability in Genetics Recombinant DNA & Biotechnology TechniquesHard IBO·2023·Q26 — ptsPDF
Q27 Dog Body Size and the IGF1 Locus Molecular Evolution & Neutral TheoryMedium IBO·2023·Q27 — ptsPDF
Q28 Xylem Embolism and Hydraulic Safety Margins Water Transport & TranspirationMedium IBO·2023·Q28 — ptsPDF
Q29 Water Stress, Photosynthesis and Turgor Water Transport & Transpiration Plant Stress Physiology & DefenseMedium IBO·2023·Q29 — ptsPDF
Q30 Wheat Nitrogen Assimilation Under Elevated CO2 Mineral Nutrition & Nutrient Uptake Calvin Cycle, Photorespiration & C4/CAM BiochemistryHard IBO·2023·Q30 — ptsPDF
Q31 Plant Biology Assertion-Reason Questions Light Reactions & Photophosphorylation Plant HormonesEasy IBO·2023·Q31 — ptsPDF