Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 21 zadań z tego arkusza, razem 21 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (3).
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Dodaj cały arkusz do zestawuTwo cells descended from the same fertilized egg develop different structures and functions. What principally explains their specialization? A. Each cell replaces all its chromosomes with unrelated DNA B. Different sets of genes are expressed during…
Which feature is characteristic of eukaryotic organization compared with a typical bacterial cell? A. A plasma membrane surrounding cytoplasm B. Ribosomes used to make proteins C. Membrane-bound internal compartments such as a nucleus D. DNA containing the…
A protein spans a phospholipid bilayer and provides a pathway for ions. Which arrangement of its regions is compatible with that location? A. A non-polar membrane-contacting surface and polar regions exposed to water B. Only polar regions in direct contact…
Living epidermal cells from a plant leaf are transferred from distilled water to a strongly hypertonic solution. What change is expected? A. The cell wall dissolves immediately B. Water enters until the protoplast bursts through the wall C. The vacuole expands…
Which process is catabolic? A. Joining amino acids into a long chain B. Hydrolysing a protein into smaller peptides C. Building glycogen from glucose D. Linking nucleotides to form RNA
Which model represents a segment of cellulose? Some hydrogen and hydroxyl groups are omitted from the carbohydrate models. A. Model A B. Model B C. Model C D. Model D
A constructed dataset estimates energy stored in different tissues. Which conclusion is supported? Tissue | Carbohydrate energy / kJ | Lipid energy / kJ | Protein energy / kJ Liver | 1450 | 2400 | 2100 Skeletal muscle | 7600 | 12800 | 65000 Adipose tissue |…
A point mutation changes one amino acid in a haemoglobin chain without changing the chain length. How can this affect the protein? A. The substitution must convert the chain into a fatty acid B. It can alter interactions and the three-dimensional structure or…
An enzyme converts substrate P to product Q. Equal enzyme and substrate concentrations are used at each pH. Which conclusion follows? A. The enzyme rate is independent of pH B. The enzyme is completely inactive at pH9 C. pH influences the measured enzyme…
Which structural comparison is correct for a typical nuclear DNA molecule and mature mRNA in a eukaryotic cell? A. DNA is normally double-stranded; mRNA is normally single-stranded B. DNA contains ribose; mRNA contains deoxyribose C. Both contain thymine as…
When human skeletal muscle relies more heavily on anaerobic respiration, which outcome is expected? A. A modest rapid ATP supply with lactate formation B. A greater ATP yield per glucose than complete aerobic oxidation C. Ethanol and oxygen as the main…
These constructed results compare corresponding gene sequences from two mammalian species. Greater divergence means more sequence differences. What can be deduced? A. The sampled autosomal sequences are less divergent than the Y-linked sequences B. The two…
Why does a normal gamete from a diploid organism carry one allele at each autosomal locus? A. All alleles are destroyed during fertilization B. It is haploid and contains one member of each homologous chromosome pair C. Mitosis removes every recessive allele…
In a model woodland survey, fungi are assigned to the nutritional groups shown. Which description matches the largest group? A. They obtain carbon mainly by photosynthesis B. They ingest large pieces of prey before internal digestion C. They digest dead…
How do increasing greenhouse-gas concentrations contribute to warming? A. They convert all infrared radiation directly into visible light B. They open a hole through every cloud C. They absorb outgoing infrared radiation, reducing energy loss at a given…
The diagram is a hypothetical food web. Which is a possible explanation for an increase in hares after lynx numbers are reduced? A. Hares may face less lynx predation, while increased voles could provide alternative prey for martens B. Fewer lynx necessarily…
A heritable variant that permits adult digestion of a particular dietary sugar becomes more frequent over many generations after that food becomes common. Which explanation is consistent with evolution? A. Eating the food directs every individual to produce…
Which sequence is consistent with clot formation after vessel damage? A. Platelets release antibodies that become red cells B. Fibrin is converted into all circulating plasma proteins C. Clotting factors trigger reactions that generate a fibrin network sealing…
Why does an antibiotic targeting bacterial cell-wall synthesis not directly treat a viral infection? A. Viruses have bacterial walls that are thicker than usual B. Viruses lack the bacterial cell-wall process targeted by the drug C. The antibiotic changes into…
In establishing the ionic gradients associated with a neuronal resting potential, what is the action of the sodium–potassium pump? A. It exchanges sodium outwards for potassium inwards B. It moves both ions only into the neuron C. It converts sodium ions into…
Which hormone and source are correctly paired with blood-glucose regulation? A. Insulin from the thyroid gland B. Glucagon from pancreatic alpha cells C. Melatonin from liver cells D. Thyroxin from pancreatic beta cells
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