Theoretical 2

Start Timed Attempt → 🏆 Leaderboard

Mixed format (multiple-choice, numeric fill-ins, true/false, and a few short-answer questions) - short-answer questions are shown for you to check against the model answer but aren't scored in the timed attempt.

Theoretical 2 Exam Official Answer Key & Solutions

Q1 Glycogen and Amylopectin Degradation by Phosphorylase and Debranching Enzyme Carbohydrate Chemistry & Biology IBO·2020·Q1 — ptsPDF

Q2 Classifying Endo-type and Exo-type Hydrolases by Biological Role Enzyme Kinetics & Regulation IBO·2020·Q2 — ptsPDF

Q3 Ethanol as a Competitive Inhibitor of Alcohol Dehydrogenase Acting on Methanol Enzyme Kinetics & Regulation IBO·2020·Q3 — ptsPDF

Q4 Predicting Sedimentation and Flotation Behavior in Three Centrifugation Setups Biomolecular Analytical Techniques IBO·2020·Q4 — ptsPDF

Q5 Molecular Crowding of Hemoglobin and Ion Diffusion in Red Blood Cells Plasma Membrane Structure & Transport Human Circulatory System IBO·2020·Q5 — ptsPDF

Q6 Identifying Cytoskeleton Types from Function and Morphology Cytoskeleton & Motor Proteins IBO·2020·Q6 — ptsPDF

Q7 Estimating Vmax and KM for GLUT1 Glucose Transport Kinetics Enzyme Kinetics & Regulation Plasma Membrane Structure & Transport IBO·2020·Q7 — ptsPDF

Q8 Which Kinetic and Environmental Data Explain Rubisco's Carboxylase/Oxygenase Balance Calvin Cycle, Photorespiration & C4/CAM Biochemistry IBO·2020·Q8 — ptsPDF

Q9 Identifying the Ohsumi Yeast Autophagy Mutant and Autophagic Body Contents Endomembrane System & Protein Trafficking IBO·2020·Q9 — ptsPDF

Q10 Matching Plant Cell Growth Types to Cellulose Microfibril and Microtubule Orientation Cytoskeleton & Motor Proteins IBO·2020·Q10 — ptsPDF

Q11 Calculating Cell Cycle Length and Initial Ratio from Growth Curves Cell Cycle, Mitosis & Meiosis IBO·2020·Q11 — ptsPDF

Q12 Determining Metabolic Pathway and ATP Yield from Gas Exchange in Yeast Bioenergetics & Central Metabolism Overview IBO·2020·Q12 — ptsPDF

Q13 Bombay Phenotype and the Probability of Blood Type B in a Second Child Extensions of Mendelian Inheritance Mendel's Laws & Probability in Genetics IBO·2020·Q13 — ptsPDF

Q14 Identifying the First Limiting Reagent in a Multi-Cycle PCR Reaction Recombinant DNA & Biotechnology Techniques IBO·2020·Q14 — ptsPDF

Q15 Engineering Candida tropicalis Gene Disruptions to Boost Xylitol Production Gene Regulation: Eukaryotic & Epigenetics IBO·2020·Q15 — ptsPDF

Q16 Diagnosing Missing DNA Replication Enzymes from Failed In Vitro Experiments DNA Structure & Replication IBO·2020·Q16 — ptsPDF

Q17 Ranking Organism Genome Sizes from a Photo Panel Chromosomal Variation: Number & Structure Major Taxa Cross-Reference IBO·2020·Q17 — ptsPDF

Q18 Predicting Spore Genotype Frequencies from Yeast Meiosis Mendel's Laws & Probability in Genetics Linkage, Recombination & Genetic Mapping IBO·2020·Q18 — ptsPDF

Q19 Genotyping T-DNA Insertion Lines by PCR Band Pattern Recombinant DNA & Biotechnology Techniques IBO·2020·Q19 — ptsPDF

Q20 Reconstructing a Two-Gene Co-Dominance Model for Flower Color Gene Interactions: Epistasis & Complementation Analysis IBO·2020·Q20 — ptsPDF

Q21 Which Animal Viruses Must Package an Enzyme Inside the Capsid Translation & the Genetic Code Recombinant DNA & Biotechnology Techniques IBO·2020·Q21 — ptsPDF

Q22 Planning a Two-Gene pBR322 Cloning Strategy with Compatible Restriction Sites Recombinant DNA & Biotechnology Techniques IBO·2020·Q22 — ptsPDF

Q23 Oocyte Attrition, Ovulation Fraction, and Maternal-Age Risk of Down Syndrome Human Reproductive System Cell Cycle, Mitosis & Meiosis IBO·2020·Q23 — ptsPDF

Q24 Interpreting Pressure-Volume Relationships Across the Cardiac Cycle Cardiovascular Physiology IBO·2020·Q24 — ptsPDF

Q25 Linking Muscle Molecular Defects to Specific Contraction Abnormalities Muscle Physiology IBO·2020·Q25 — ptsPDF

Q26 Interpreting Gene A and Gene B Function in Endochondral Ossification Human Skeletal System IBO·2020·Q26 — ptsPDF

Q27 Testing How Honeybees Measure Flight Distance for the Waggle Dance Animal Communication Orientation & Navigation IBO·2020·Q27 — ptsPDF

Q28 CYP2C19 Polymorphisms and Drug Metabolism of Omeprazole and Clopidogrel Digestive & Metabolic Physiology Population Genetics & Hardy-Weinberg Equilibrium IBO·2020·Q28 — ptsPDF

Q29 Factors Driving Coronavirus Genome Variation and Cross-Species Transmission Molecular Evolution & Neutral Theory Coevolution & Species Interactions IBO·2020·Q29 — ptsPDF

Q30 Photoperiod, Growth Rate and the Timing of Red Leaf Formation in Amaranth Photoperiodism, Vernalization & Flowering IBO·2020·Q30 — ptsPDF

Q31 Auxin, Cytokinin and Density Effects on Bud Formation in the Moss Physcomitrella Plant Hormones IBO·2020·Q31 — ptsPDF

Q32 Turgor Pressure and Tissue Layer Mechanics in Explosive Seed Dispersal Plant Stress Physiology & Defense IBO·2020·Q32 — ptsPDF

Q33 Diagnosing Whether a Tendril Is a Modified Leaf or Modified Stem Plant Body Plans Across Major Lineages Stem Anatomy IBO·2020·Q33 — ptsPDF

Q34 Two-Preceding-Leaf Rule for Leaf Positioning in the Fibonacci Spiral Tropisms & Nastic Movements Plant Hormones IBO·2020·Q34 — ptsPDF

Q35 Nitrogen Source and the Reductant Competition Behind CAQ in C3 versus C4 Plants Calvin Cycle, Photorespiration & C4/CAM Biochemistry IBO·2020·Q35 — ptsPDF

Q36 Estimating Deleterious Mutations Passed On by Fathers of Different Ages Molecular Evolution & Neutral Theory Population Genetics & Hardy-Weinberg Equilibrium IBO·2020·Q36 — ptsPDF

Q37 Tracking Hox Cluster and Gene Duplication History Through Vertebrate Phylogeny Chromosomal Variation: Number & Structure Molecular Systematics IBO·2020·Q37 — ptsPDF

Q38 Molecular Clock Estimates of Substitution Counts, Divergence Time and Domain-Specific Rates Molecular Evolution & Neutral Theory IBO·2020·Q38 — ptsPDF

Q39 Identifying Unlabeled Cetartiodactyl DNA Samples from a Phylogenetic Sequence Alignment Molecular Systematics Evidence for Evolution IBO·2020·Q39 — ptsPDF

Q40 Tracing Membrane Origins in the Four-Membrane Plastids of Chlorarachniophytes History of Life: Origin & Major Transitions Endomembrane System & Protein Trafficking IBO·2020·Q40 — ptsPDF

Q41 Projecting a Three-Stage Population Forward and Finding the Extinction-Preventing Birth Rate Population Genetics & Hardy-Weinberg Equilibrium IBO·2020·Q41 — ptsPDF

Q42 Matching Plant Morphological Plasticity Responses to Environmental Cues Plant Stress Physiology & Defense IBO·2020·Q42 — ptsPDF

Q43 Direct and Inclusive Fitness in a Haplodiploid Hymenopteran Insect Kin Selection, Altruism & Eusociality IBO·2020·Q43 — ptsPDF

Q44 Tracing Detrital and Grazing Food-Web Pathways and Cesium Bioaccumulation Timing Ecology IBO·2020·Q44 — ptsPDF

Q45 Nitrogen and Phosphorus Accumulation Trajectories Through Primary Succession Ecology IBO·2020·Q45 — ptsPDF