IB Biology Practice Exam – All Questions

Browse all practice questions for the IB Biology Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

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Esters aren’t a main carbon‑compound class in biology, and here’s whyWhich of the following is NOT one of the four main classes of carbon compounds?Geographic isolation explains how physical barriers drive reproductive isolation and speciationWhich type of reproductive isolation occurs due to physical barriers?Kingdom: the broadest level of classification that groups organisms by general featuresWhich level of classification groups organisms based on very general features?The Importance of a Nucleus in Eukaryotic CellsWhich of the following is a characteristic of eukaryotic cells?Understanding 80S Ribosomes in Eukaryotic CellsWhat type of ribosomes are present in eukaryotic cells?Understanding Eukaryotic Cell Structure and Its Key ComponentsWhich of the following is NOT a component of eukaryotic cell structure?Understanding how point mutations create new allelesWhat type of mutation results in the formation of new alleles?Understanding the Building Blocks: What Are Polypeptides Made Of?What are polypeptides made up of?Understanding the Characteristics of Integral Proteins in Cell MembranesWhat type of proteins are integral proteins characterized by?Understanding the Concept of Carbon Pools in Our EnvironmentWhat is meant by the term carbon pool?Understanding the Concept of Emergence in Biological SystemsWhich term describes the concept where whole is greater than the sum of its parts?Understanding the Functional Groups That Define LipidsWhich functional group is characteristic of lipids?Understanding the Key Role of Cyclin B in the Cell CycleWhat is the main role of Cyclin B in the cell cycle?What You Need to Know About Gene Pools and Genetic DiversityWhat is a gene pool?

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Which of these statements is true regarding condensation reactions?
What type of enzyme inhibition involves binding directly to the active site?
What is the basic unit of life?
According to Mendel's First Law of Segregation, what is true about alleles?
Which of these is a function of life?
What is the primary function of the cell membrane?
During which phase of meiosis do homologous chromosomes segregate?
Haploid nuclei are defined by which of the following characteristics?
Which level of taxa is used to describe a group of closely related species?
What is a common condition associated with Stargardt's macular degeneration?
Which biome is characterized by very low temperatures and limited vegetation?
Which class of molecules is primarily responsible for storing genetic information?
Which of the following is NOT a property of water?
Which characteristic defines prokaryotic cells?
What occurs during the process of transcription in cells?
Which class of carbon compounds primarily serves as a source of energy and structural material?
Which process involves the movement of particles across a membrane without energy input from the cell?
What are homologous structures?
What is the main purpose of PCR (Polymerase Chain Reaction)?
What distinguishes homologous structures from analogous structures?
Which of the following describes the relationship between alleles and genes?
What is the effect of genetic drift on a population?
Isotonic solutions are characterized by what property related to osmolarity?
What is the primary role of the xylem in plants?
Which of the following statements about plasma membranes is true?
What do abiotic factors in an ecosystem include?
What are amino acids primarily used for in biological systems?
What does anabolism specifically involve?
What ecological role do decomposers play?
What is meant by gene expression?
Which taxonomic level is more specific than Family?
What is the relationship between structure and function in biology?
How do mutations affect protein synthesis?
What encompasses a series of chemical reactions often taking place in genetic processes?
What characterizes saturated fatty acids?
What feature is unique to prokaryotic cells compared to eukaryotic cells?
Which of the following correctly defines stem cells?
What defines ecological succession?
Which process is critical for the formation of gametes?
What are proteins composed of?
Which of the following best describes analogous structures?
Speciation occurs when:
Which type of solution has a higher osmolarity than the cell cytoplasm?
What is the purpose of meiosis?
What is the process of transcription?
What is the role of cyclin D in the cell cycle?
Genetic drift is most significant in which type of population?
What type of bond is primarily responsible for the cohesiveness of water molecules?
What is the main purpose of photosynthesis?
What role does cholesterol play in animal cell membranes?
What is the primary function of the Golgi apparatus?
What condition is caused by a base substitution mutation?
What is the role of the nucleus in a cell?
Prokaryotic cells are characterized by which feature?
Why is genetic variation important to populations?
What is catabolism characterized by?
What role do enzymes play in metabolic reactions?
Which type of enzyme inhibitors alter the enzyme's shape by binding elsewhere?
What is the primary function of ATP within cells?
Which level of classification has the highest number of organisms?
What role do detritivores play in an ecosystem?
Temporal isolation primarily occurs when:
What is recombination in the context of genetics?
According to the Davson-Danielli model, what structures were thought to be adjacent to the phospholipid bilayer?
What distinguishes a Genus from a Species?
What does the Endosymbiotic Theory propose about mitochondria?
Which of the following is an example of an atypical cell?
Which of the following cells undergoes binary fission for reproduction?
What does the field of epigenetics study?
Which cyclin is primarily responsible for preparing DNA for replication?
Which taxa classification includes the most diverse group of organisms?
In the context of ecology, why is competition considered a critical interaction?
What class of macromolecules consists of sugars and starches?
What characterizes hypotonic solutions?
Which of the following is a direct outcome of PCR?
What is the primary role of enzymes in biological systems?
How do enzymes function in a biochemical reaction?
What is a recombinant chromosome?
In which phase do eukaryotic cells replicate their DNA?
According to the cell theory, which statement is true?
What term is used for the various specific forms of a gene?
Which of the following processes can lead to the adaptation of species?
Mendel's Second Law of Independent Assortment states that:
What type of bond is formed between amino acids during protein synthesis?
What can be inferred about the genetic diversity of offspring produced through independent assortment?
How do saprotrophs obtain their nutrients?
Which type of mutations are implicated in the development of tumours?
In ecological terms, what does ‘disturbance’ refer to?
Which taxonomic classification is often used as the scientific name of an organism?
What are gametes?
What defines a mutualistic relationship in symbiosis?
In which type of cells would you typically find chloroplasts?
Which macromolecule is primarily responsible for chemical reactions in living organisms?
Which is NOT a main source of stem cells?
What is commonly the result of a mutation in DNA?
Which event could trigger the process of ecological succession?
Which structure is responsible for detoxifying harmful substances in the cell?
Which of the following is NOT one of the seven functions of life?
What is the main purpose of conducting a controlled experiment?
Which macromolecule is primarily responsible for storing genetic information?
What is the function of Cyclin A during the cell cycle?
What are adaptations in an ecological context?
Which term describes the web of all enzyme-catalyzed reactions in a cell?
What is the primary role of chlorophyll in photosynthesis?
What is the role of the pancreas in the human body?
What does osmolarity refer to?
What do emergent properties refer to in multicellular organisms?
What is an action potential?
What does the term carrying capacity refer to?
What is the structural arrangement of DNA?
What taxa is categorized as the lowest level in biological classification?
Which component of the cell is responsible for maintaining its structure?
Which statement best describes evolution?
Which cyclin helps in the transition from the G1 phase to the S phase?
Triglycerides are formed by which type of reaction?
What does crossing over refer to in meiosis?
What defines passive transport across a membrane?
What does the fluid mosaic model describe?
What role does biodiversity play in ecosystems?
Eukaryotic cells are characterized by which of the following features?
What are plasmids primarily classified as?
How do adaptations enhance an organism's survival?
What did Gorter and Grendel propose about plasma membranes?
Which of the following best describes nucleotides?
Which process specifically refers to the diffusion of water molecules?
What defines autotrophs in an ecosystem?
What is a zygote?
What is the primary difference between mitosis and meiosis?
During which phase of the cell cycle is the cell most active in terms of metabolic processes?
What is one primary difference between DNA and RNA?
Which level of taxa is the broadest classification in biological taxonomy?
What type of energy does photosynthesis convert solar energy into?
Fitness, in terms of biology, refers to what?
Polysaccharides are primarily formed from which biological units?
What does the property of being a solvent in water enable it to do?
Peripheral proteins are primarily characterized as being:
What do enzymes increase in a substrate?
What is a primary limitation of unicellular organisms regarding size?
What is the process of natural selection?
What is the primary function of the rough endoplasmic reticulum in eukaryotic cells?
Which of the following statements about interphase is true?
How do enzymes function in biological reactions?
What constitutes a community in ecological terms?
Which of the following describes an ecological niche?
What does competition refer to in ecological terms?
Which of the following elements is found in nucleic acids but not in carbohydrates?
Which role does water play as a temperature regulator in biological systems?
What are carbohydrates primarily composed of?
Why is the nitrogen cycle important for ecosystems?
What describes different versions of a single gene?
Which taxonomic rank is directly above Genus?
What does homeostasis refer to?
What does a trophic level represent?
What role do cyclins play in cell biology?
Controlled experiments are essential for what scientific purpose?
What is a change to DNA that can lead to new alleles called?
What defines a macromolecule or polymer?
A segment of DNA that influences specific traits is known as what?
What structure is NOT found in prokaryotic cells?
Which scenario is an example of ecological succession?
Behavioral isolation is most often seen when:
How is the base sequence changed in sickle cell anemia?
Why is DNA replication important?
What functional groups are found in lipids?
What are stem cells?
What defines autotrophs and heterotrophs?
What is the role of protein channels in facilitated diffusion?
Which of the following is NOT a type of macromolecule?
Which of the following best defines a species?
Within metabolism, which process typically requires energy input?
What defines a population in biological terms?
What does simple diffusion involve?
What is the result of meiosis in terms of chromosome number?
How can symbiosis be defined in ecological terms?
What is the primary function of a stem cell?
How is an ecosystem defined?
What is true about organisms classified within the same Clade?
What are consumers in ecological terms?
Which statement correctly describes water molecules?
The complete set of genetic information in an organism is referred to as what?
Carbon flux describes which of the following?
Diploid nuclei contain:
What distinguishes prokaryotic cells from eukaryotic cells?
What is cellular differentiation?
Which model of plasma membrane structure was developed by Singer and Nicolson?
What role do B cells play in the immune response?
What class of compounds includes enzymes and antibodies?
What does biomass refer to in an ecological context?
Why is water considered essential for biological systems?
What do homologous chromosomes have in common?
Which of the following best describes how antibodies operate in the immune system?
Which best describes a climax community in ecological succession?
What is the primary role of ribosomes in a cell?
What is meant by adhesion in the context of water’s properties?
What is the primary function of mitosis in a cell?
What is the significance of the scientific method in biology?
Which type of glucose has a hydroxyl group positioned differently than the other?
What is a critical element of a controlled experiment?
What is the primary characteristic of the Clade?
What defines a habitat?
Why is genetic drift considered a random process?
What defines a linkage group in genetics?
What effect does the mutation causing sickle cell anemia have on the amino acid sequence?
What is a gene?
In what way do antibodies facilitate the immune response?
What is the correct sequence of taxonomic ranks from broadest to most specific?
What does the term "cohesion" refer to in chemistry?
What is a significant factor in identifying genetic drift?
Which of the following is characterized by containing fatty acids?
What is the primary function of mitochondria?
In the hierarchy of biological classification, which level comes immediately after Kingdom?
Which of the following is NOT considered a major biome on Earth?
What are alleles?
What is the primary role of homologous chromosomes during meiosis?
What happens during the process of mitosis?
Which of the following is NOT a function of proteins?
What does molecular biology explain?
Leukemia primarily affects which type of blood cells?
Which molecule is a five-carbon sugar?
What type of organism strictly consists of a single cell?
What is the function of the lysosome?
What are the stages of cellular respiration?
Which of the following does not represent a type of reproductive isolation?
In terms of abiotic factors, which of the following is not included?
In the taxonomy hierarchy, which of the following is not considered a taxonomic rank?

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