Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 27 zadań z tego arkusza, razem 27 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Evaluating biological evidence and methods (2).
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Dodaj cały arkusz do zestawuFresh samples of mammalian erythrocytes are placed in NaCl solutions for the same duration. Which explanation is consistent with the high percentage of ruptured cells at 0.03 mol L⁻¹? A. Salt molecules actively transport water out of the cells B. Water enters…
The membranes have the same phospholipids but different cholesterol contents. At a high physiological temperature, which membrane would cholesterol make least fluid? A. A B. B C. C D. D
Two nutrient-broth cultures are held in identical open swan-neck flasks that admit air but trap airborne particles. Broth in P is boiled first; broth in Q is not. After six days P remains clear while Q contains many microorganisms. Which conclusion is…
Which property of glucose permits it to be carried dissolved in blood plasma? A. It is completely non-polar B. Its molecules are too large to interact with water C. Its polar groups interact with water molecules D. It is a lipid with no oxygen atoms
Which group occupies the unmodified end X of this polypeptide? A. A phosphate group B. A second free amino terminus C. A methyl group only D. A carboxyl group
A student constructs an action spectrum for a photosynthetic alga. What quantity is plotted against the wavelength of incident light? A. The number of chromosomes in each cell B. The relative rate of photosynthesis C. The fraction of light absorbed by an…
Which cellular process is anabolic? A. Hydrolysis of a storage polysaccharide B. Breakdown of an amino acid for respiration C. Assembly of amino acids into a new enzyme D. Oxidation of a respiratory substrate to smaller products
An enzyme converts a finite amount of substrate to a stable product in a closed assay. Initially no product is present. Which curve best represents product accumulation as substrate becomes limiting? A. Q B. R C. P D. S
Which collection includes the complete DNA genome of a typical nucleated mammalian cell? A. Only the DNA in the nucleus B. Only mitochondrial DNA C. Nuclear DNA together with mitochondrial DNA D. Only DNA in one chromosome
This pedigree shows a fully penetrant inherited condition. Assume no new mutations. Which pattern fits it? A. Autosomal dominant inheritance B. Y-linked inheritance C. X-linked dominant inheritance D. Autosomal recessive inheritance
A livestock procedure begins with fertilization, followed by divisions and separation of the cells shown. What is structure X before separation? A. A cluster of unfertilized eggs B. An early embryo C. One ovarian follicle D. A cluster of independently…
The table gives rounded values for a constructed atmosphere scenario. Which gas makes the largest modelled contribution to warming? Gas | Concentration / ppm | Approximate persistence / years | Modelled warming contribution / relative units Carbon dioxide |…
Which forms of energy enter the producer at X and pass to the primary consumer at Y? A. X: thermal; Y: nuclear B. X: chemical; Y: light C. X: light; Y: chemical D. X: kinetic; Y: thermal
Which set contains an ancestor and all of its descendants on this rooted tree? A. A and C, with their common ancestor B. B and D, with their common ancestor C. A and B, with their common ancestor D. C and D, with their common ancestor
A bacterial strain develops a mechanism that destroys most DNA arriving from other species. What is a likely effect on acquisition of antibiotic resistance through horizontal gene transfer? A. It becomes less frequent because incoming resistance genes are less…
At 2.5 s the pressure shown drives air out of the lungs. Which muscle activity would support forced expiration? A. Contraction of the diaphragm and external intercostals B. Relaxation of every respiratory muscle while thoracic volume increases C. Contraction…
Which interaction exemplifies negative feedback in regulation of the ovarian cycle? A. Oestradiol enhances all gonadotropin secretion at every concentration and stage B. FSH permanently prevents every follicle from growing C. All progesterone is produced only…
A blood-feeding organism secretes a molecule that blocks thrombin activity. Which step is directly inhibited? A. Formation of fibrin from fibrinogen B. Formation of all erythrocytes in bone marrow C. Synthesis of haemoglobin from fibrin D. Production of…
A promoter lies beside the coding region of a gene. What role does it have in gene expression? A. It is the site where a ribosome binds the mature protein B. It seals Okazaki fragments after replication C. It helps recruit the machinery that initiates…
Which levels of protein structure are visible in this representation? A. Secondary and tertiary B. Quaternary only C. Primary sequence only, with no folding D. Quaternary and a lipid bilayer
A pathway converts substrate S into an unwanted product. Molecule J reversibly inhibits the first enzyme by competing with S. How does J act? A. It destroys all enzyme molecules irreversibly B. It binds the active site and reduces access by S C. It binds only…
Which row correctly places water splitting and RuBP carboxylation in a chloroplast? A. Water splitting: stroma; RuBP carboxylation: outer envelope B. Water splitting: thylakoids; RuBP carboxylation: stroma C. Water splitting: outer envelope; RuBP…
What can pass through the connections X during loading at a source? A. Intact starch granules as the principal transported sugar B. Cellulose fibres for long-distance transport C. Sucrose moving between the cells D. Whole chromosomes replacing all sieve-tube…
Young oat shoots bend towards a lamp positioned on their right. What explains the differential growth? A. Auxin accumulates on the brighter right side and stops mitosis everywhere B. More auxin on the shaded left side promotes greater cell elongation there C.…
Seeds from several terrestrial plants are kept moist. Which additional conditions are generally necessary for germination? A. Abundant carbon dioxide and external glucose B. Mineral fertilizer and complete darkness in every species C. An appropriate…
Assume this distribution arose through differential survival in a population that previously had most birds with intermediate beak depths. Which type of selection best explains it? A. Stabilizing selection B. Disruptive selection C. Directional selection…
Which structural feature helps water and small solutes enter the filtrate from glomerular blood? A. A thick waterproof wall around every capillary B. An absence of blood pressure inside the glomerulus C. Fenestrations in glomerular capillary endothelium D.…
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