Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 30 zadań z tego arkusza, razem 30 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Halving chromosome number through meiosis (2).
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Dodaj cały arkusz do zestawuA research team is considering replacing sensory cells lost through an inherited disorder. Which property makes a suitable stem-cell population useful for this approach? A. It can differentiate into the damaged cell type B. It must already contain a complete…
Why do animal-cell membranes contain cholesterol among their phospholipids? A. It forms the aqueous pore of each ion channel B. It adjusts membrane fluidity across temperature changes C. It joins neighbouring cells by peptide bonds D. It supplies the…
Equal cylinders cut from a storage root are placed separately in sucrose solutions of 0.00, 0.20, 0.40, 0.60 and 0.80 mol dm⁻³. The solution isotonic with the tissue is 0.35 mol dm⁻³. Assuming the sucrose does not enter the cells during the test, how many…
A small insect is supported by the water surface without breaking through it. Which interaction principally creates the surface tension that supports the insect? A. Attraction of water to cellulose in plant walls B. The thermal motion responsible for…
In PCR, a pair of primers is chosen to flank a selected DNA segment. What does this choice determine? A. Which region is amplified B. Which enzyme separates strands by hydrolysing DNA C. Which RNA codons are translated D. Which bases are removed from the…
This sealed apparatus is kept at constant temperature. Initially the liquid levels in the two arms were equal. The diagram shows the later result. Potassium hydroxide absorbs carbon dioxide. What does the result indicate? A. The living seeds produce more…
Which geological change is consistent with oxygen-producing photosynthesis becoming established on early Earth? A. A rock layer containing nitrogen proves the first use of chlorophyll B. Every carbonate deposit records the first terrestrial forest C. Formation…
The table contains model genome sizes for four organisms. Which conclusion is supported? Organism | Genome size / million base pairs Bacterium | 4.6 Insect | 190 Mammal | 2800 Flowering plant | 92000 A. The plant must have exactly thirty times as many…
Which change normally occurs in meiosis I? A. Homologous chromosomes separate, reducing the number of chromosome sets B. All sister chromatids separate to give four nuclei immediately C. The two resulting nuclei acquire identical combinations of parental…
Use these DNA profiles to identify the parental pairing consistent with all bands in each child. A. P with X and Q with Y B. P with Y and Q with X C. P with both X and Y D. Q with both X and Y
A sealed terrestrial mesocosm exchanges energy but no matter with its surroundings. Which quantities may change over several days? I. Total carbon in the whole vessel II. Temperature III. Mass of living organisms A. I only B. I and II C. II and III D. I, II…
This model pyramid gives annual energy flow through four trophic levels. Which conclusion follows from the values? A. The pyramid directly gives the number of organisms at every level B. The largest loss shown is reflected sunlight before it reaches producers…
Consumption of fossil fuels has increased greatly since industrialization. How does combustion contribute to the enhanced greenhouse effect? A. Combustion products such as CO₂ absorb outgoing infrared radiation B. Most of the effect comes from preventing…
Breeders repeatedly select different traits from the variation present in a domesticated animal population. What outcome illustrates selective breeding? A. The original population must lose every form of genetic variation B. Several breeds with different…
Why can repeated antibiotic use increase the frequency of resistance in a bacterial population? A. The antibiotic purposefully gives every bacterium a useful mutation B. Natural selection changes the antibiotic molecule into food C. Susceptible bacteria are…
Two hypothetical plant species are assigned to different genera within the same order. In the traditional taxonomic hierarchy, which rank must they also share? A. Species B. Genus C. Family D. Class
Calculate tidal volume and ventilation rate from this model trace. A. 0.6 L and 12 breaths min⁻¹ B. 2.8 L and 12 breaths min⁻¹ C. 0.6 L and 4 breaths min⁻¹ D. 2.8 L and 4 breaths min⁻¹
Four stimuli of increasing strength are applied at t1–t4. Which inference is supported by the trace? A. The fourth response rises by only 32 mV from rest B. The threshold is approximately −32 mV C. Only the fourth stimulus changes membrane potential at all D.…
During bacterial DNA replication, which enzyme replaces RNA primer segments with DNA? A. DNA ligase B. DNA gyrase C. DNA polymerase I D. DNA primase
A newly transcribed eukaryotic pre-mRNA contains coding and intervening regions. Which processing step can prepare it for translation? A. Amino acids are attached to every intron B. Exons are converted into DNA primers C. The ribosome adds a chromosome to its…
Which statement is consistent with non-competitive inhibition of an enzyme? A. The inhibitor can bind away from the active site without resembling the substrate B. The inhibitor must have exactly the substrate’s shape C. It blocks catalysis only by occupying…
During aerobic oxidation of glucose, which stages release carbon dioxide? A. Glycolysis and the electron transport chain, but not the Krebs cycle B. The link reaction and Krebs cycle C. Glycolysis and oxidative phosphorylation only D. The electron transport…
Actively photosynthesizing algae receive a pulse of labelled carbon dioxide. After sufficient time for label to move through the Calvin cycle and into its carbohydrate products, which compounds can contain labelled carbon? I. Ribulose bisphosphate II.…
A cut leafy shoot is connected to a sealed potometer. An air bubble in its capillary moves towards the shoot as water is taken up. With other factors controlled, in which conditions is movement usually fastest? A. Warm, humid air B. Cool, dry air C. Cool,…
Which pressure relationship drives bulk flow of phloem sap from a source region towards a sink? A. Higher hydrostatic pressure at the source than at the sink B. Higher hydrostatic pressure at the sink than at the source C. Exactly equal hydrostatic pressure at…
Compare one cell just after meiosis I with one cell just after meiosis II from the same normal meiotic sequence. Which is correct? A. DNA replication occurs between the two stages B. The earlier cell contains more chromatids C. The earlier cell has fewer…
In a model plant, purple flowers (P) and tall stems (T) are dominant. A cross of PPTT with pptt produces PpTt offspring. These are crossed with each other. If the loci assort independently, how many of 640 second-generation plants are expected to be purple and…
Which situation illustrates temporal reproductive isolation between two populations that could otherwise interbreed? A. They use different courtship signals during the same season B. A sea channel separates them throughout the year C. Different pollinators…
The model below summarizes ABO antigens on red blood cells and antibodies in plasma. Ignore all other blood-group systems. Which conclusion about a red-cell transfusion follows? Group | Red-cell antigens | Plasma antibodies A | A | Anti-B B | B | Anti-A AB | A…
Following entry of one sperm into a human egg, the cortical reaction modifies the zona pellucida. What is the principal consequence? A. The zona becomes a source of amino acids for all embryos B. Additional sperm are prevented from entering C. The egg…
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