Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 34 zadania z tego arkusza, razem 34 punkty, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Halving chromosome number through meiosis (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuWhich pair of labels is correctly matched to the structures in this model bacterium? A. R: ribosome; Q: plasma membrane B. S: mitochondrion; P: nuclear envelope C. Q: cellulose wall; R: chloroplast D. P: nucleolus; S: secretory vesicle
Which description fits the labelled regions of the membrane lipid? A. Both regions carry the same exposed negative charge B. X interacts with water; Y is non-polar C. X avoids water; Y is an ionic phosphate group D. X is a hydrocarbon chain; Y is water-soluble
A cell uses both facilitated diffusion and active transport. What feature can these processes share? A. Direct passage of every solute through the lipid core B. An obligatory release of oxygen C. Movement through integral membrane transport proteins D. A…
An algal cell has smaller ribosomes inside its chloroplasts than in its surrounding cytosol. Which evolutionary explanation accounts for this observation? A. All chloroplast proteins are exactly half the length of cytosolic proteins B. Every ribosome shrinks…
Which set of processes can establish and enlarge a new tumour at a site distant from an original malignant tumour? A. Cell spread, nuclear division and division of cytoplasm B. Cell migration followed only by cell enlargement, without producing daughter cells…
A model protein contains three separate linear polypeptide chains, each with 24 amino-acid residues. There are no peptide links between chains. How many peptide bonds are present? A. 75 B. 69 C. 71 D. 72
Substrate is supplied at the same concentration in all tests of a model enzyme. Which proposed mechanism is consistent with the results, although not proved by them? A. Z is required for all catalytic activity because the enzyme is inactive without it B.…
Which list contains only complementary pairs in ordinary double-stranded DNA? A. A with U, and G with T B. A with C, and T with G C. U with C, and A with G D. A with T, and G with C
A baker keeps a yeast-containing dough at a moderately warm temperature, rather than refrigerating or strongly heating it. Why can this promote expansion? A. Fermentation releases carbon dioxide rapidly while the yeast enzymes remain functional B. The yeast…
A DNA sequence variant not previously present appears in a population. Which process can create this new allele? A. Producing genetically identical copies without mutation B. A change in a gene’s nucleotide sequence C. Sorting existing alleles into gametes…
A cell from a diploid animal is shown with its chromosome complement represented schematically. Which classification best fits the chromosome complement? A. A haploid unfertilized egg B. A cell with no homologous chromosome pairs C. A diploid body cell D. A…
This pedigree tracks a fully penetrant X-linked recessive condition. Assume no new mutations. Which statement about the family is supported? A. I-1 must carry the allele without expressing it B. III-1 proves that an affected male cannot reach adulthood C.…
When a voltage is applied across an agarose gel, why do DNA fragments migrate towards the anode? A. Their negatively charged phosphate backbones are attracted to the positive electrode B. Their phosphate groups are positively charged at the electrophoresis pH…
A woodlouse eats fragments of dead leaves, while a fungus releases enzymes onto the same litter. What distinction explains these feeding modes? A. The animal converts inorganic minerals directly into food B. The animal digests ingested material internally; the…
Which pair of energy transfers occurs in living systems? A. Light into chemical energy during photosynthesis; environmental heat directly into ATP synthesis B. Chemical energy into electrical gradients; metabolic heat recycled completely into chemical energy…
Which ecological unit includes all components enclosed by the boundary? A. A single population B. Only a community of organisms C. One species’ geographical range D. An ecosystem
Which set of processes can contribute to changes in the atmospheric carbon dioxide record? A. Photosynthetic uptake, cellular respiration and fuel combustion B. Only nitrogen fixation and ozone destruction C. Only evaporation and condensation of pure water D.…
Which change qualifies as biological evolution in a population? A. The daily opening and closing of stomata B. A change in inherited characteristics across generations C. A temporary suntan acquired by one individual D. An increase in one organism’s mass after…
Under persistent selection, what generally distinguishes individuals with higher biological fitness? A. They must avoid all competition throughout life B. They produce genetically identical offspring exclusively C. They contribute more surviving offspring to…
Which conclusion follows from the branching pattern? Branch lengths do not indicate elapsed time. A. K is necessarily the direct living ancestor of N B. L shares no common ancestor with N C. M and N must have identical DNA sequences D. M and N share a more…
How do the lumen and elastic tissue help a large artery carry blood between ventricular contractions? A. The lumen provides a flow space and elastic recoil helps sustain pressure B. The lumen makes blood cells and elastic tissue forms the heart’s valves C. The…
What structural event helps convert blood at a wound into a clot? A. Platelets transform directly into collagen fibres B. A fibrin network retains blood cells C. Soluble fibrinogen forms a stable mesh without conversion to fibrin D. Fibrin dissolves the…
Which sequence describes the main membrane events in a neuronal action potential? A. Sodium channels close → sodium enters → repolarization → potassium is synthesized B. ATP leaves the axon → the nucleus depolarizes → sodium channels are removed C. Sodium…
At one replication fork, which statement distinguishes formation of the two new DNA strands? A. The leading strand is synthesized without any template B. Only the lagging strand contains phosphodiester bonds C. The leading strand is extended only in the 3′ to…
Which set consists of DNA regions that can have functions without encoding polypeptide sequences? A. A promoter, a telomere and a tRNA gene B. A promoter, a translated exon and a telomere C. A tRNA gene, a protein-coding exon and a DNA replication origin D. A…
A single polypeptide with the ribbon arrangement shown forms a functional enzyme without other polypeptide subunits. Which levels of organization are present? A. Primary and quaternary, but no tertiary B. Primary, secondary and tertiary C. Secondary and…
In a respiratory model, a hydroxy group is converted to a carbonyl group while NAD is converted to reduced NAD: R–CH(OH)–R′ + NAD → R–C(=O)–R′ + reduced NAD. What happens to the organic substrate? A. It undergoes decarboxylation B. It is reduced by gaining…
Which combination explains how cellulose can help support water movement along plant cell walls? A. It must dissolve completely before water can touch it B. It repels every water molecule because it contains no polar groups C. It converts water into glucose…
Which labelled position contains the site where gametes fuse in this flower? A. S B. P C. Q D. R
During normal meiosis, when are sister chromatids pulled towards opposite poles? A. Before DNA has replicated B. During anaphase of the second division C. During prophase of the first division D. When homologues first pair
A testcross of a double-heterozygous plant yields four phenotypic classes with counts 132, 28, 32 and 128. Independent assortment predicts equal proportions. The calculated chi-squared value is 125.2, compared with a 5% critical value of 7.815. What conclusion…
Which event can create a reproductive barrier in a plant lineage within very few generations? A. Reshuffling existing alleles by independent assortment without altering chromosome number B. Inheritance of a continuously variable trait through many…
Which material could enable a vaccine to initiate an antigen-specific immune response? A. A pathogen antigen or RNA instructions for producing that antigen B. Ready-made antibodies that provide protection without exposing the recipient to pathogen antigen C.…
Which hormone promotes contractions of the muscular uterine region labelled X during childbirth? A. Calcitonin B. Oxytocin C. Insulin D. Melatonin
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