Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 18 zadań z tego arkusza, razem 18 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: The membrane's hydrophobic barrier (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuAseptate fungal hyphae and skeletal muscle fibres are often considered atypical cells. What feature do they share? A. Each lacks every membrane-bound organelle B. Many nuclei can occupy one continuous cytoplasmic region C. Both have a cellulose wall D. Both…
Which structure is present in a typical nucleated animal cell? A. A starch-storing amyloplast B. A mitochondrion C. A peptidoglycan cell wall D. A large central sap vacuole
Which labelled regions in this membrane model are hydrophilic? A. I and II B. III and IV C. I and III D. II and IV
Glucose moves into a cell down its concentration gradient through a glucose carrier. Why is a membrane protein needed? A. Every downhill movement requires ATP hydrolysis B. Glucose is too non-polar to enter a lipid layer C. The carrier reverses the glucose…
What do the formation of a polysaccharide and the formation of a triglyceride have in common? A. Both involve condensation reactions B. Both create a chain made only of amino acids C. Both require an equal number of carbon and oxygen atoms D. Both produce…
Enzyme concentration and temperature are constant. Why does the initial reaction rate change very little above a substrate concentration of 8 mmol L⁻¹? A. The enzyme has become a molecule of substrate B. The enzyme’s active sites are effectively saturated C.…
How many mRNA bases specify the amino acids in this model peptide? Count only bases in the amino-acid codons, excluding a stop codon and untranslated regions. A. 40 B. 80 C. 60 D. 20
Plants are supplied with sufficient mineral nutrients and kept at their optimum temperature. CO₂ remains at ambient concentration. Which factor could limit the plateau reached at a light intensity of 360 units? A. Insufficient light at that point on this curve…
Which event occurs in mitosis and also during meiosis II? A. Sister chromatids separate after their centromeric association is released B. Homologous pairs undergo crossing over in every division C. Homologous chromosomes pair at the equator in both processes…
Assume this model condition is controlled by one gene, has complete penetrance and involves no new mutation. Where are the condition-causing alleles in affected individuals? A. Only on the Y chromosome B. Only on one X chromosome in every affected person C. On…
Unrooted stem cuttings are used to propagate a plant. Which procedure most directly reduces the danger of dehydration before roots develop? A. Remove every stem node so no new tissues can form B. Use only flowering shoots because flowers prevent transpiration…
Identify P, Q and R in this model of a sunlit meadow ecosystem. A. P: minerals; Q: oxygen; R: chemical energy B. P: sunlight; Q: dissipated heat; R: inorganic nutrients C. P: glucose from space; Q: new carbon atoms; R: sunlight D. P: heat recycled from…
A constructed climate record shows atmospheric CO₂ rising from 305 to 465 ppm while the long-term temperature anomaly rises from −0.2 to +1.3 °C. Which mechanism can explain the warming contribution of the additional CO₂? A. CO₂ removes the need for the Earth…
Two distantly related mammal lineages have independently evolved defensive spines from hairs. Which explanation is consistent with their separate origins? A. The spines must have been inherited unchanged from their most recent common ancestor B. The two…
The table gives constructed pressures during one cardiac cycle. Which vessel property helps explain why pressure fluctuates less in the aorta? Location | Highest pressure / mmHg | Lowest pressure / mmHg Left ventricle | 132 | 4 Aorta | 128 | 78 A. Its valves…
Which sequence correctly summarizes the clotting response to a damaged blood vessel? A. Thrombin → destruction of all platelets → fibrin converted to fibrinogen B. Fibrin formation → removal of clotting factors → platelet activation C. Fibrinogen → haemoglobin…
What initiates the increase in thoracic volume during a normal inspiration? A. Air forcing the diaphragm upwards before the muscles act B. An increase in intrapulmonary pressure above atmospheric pressure C. Relaxation of all inspiratory muscles at once D.…
In a simplified physiology case, a person has reduced metabolic heat production, persistent cold intolerance and unusually low energy expenditure. Reduced secretion of which hormone is most consistent with this pattern? A. Epinephrine B. Thyroxin C. Insulin D.…
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