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: Organization of a eukaryotic cell (2), Coordinating the cardiac cycle (2).
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Dodaj cały arkusz do zestawuA eukaryotic cell contains a nucleus next to its rough endoplasmic reticulum. Which description applies to the nucleus? A. DNA associated with proteins is enclosed by two membranes B. Cristae surround the cell’s principal site of ATP production C. Stacked…
A unicellular ciliate is observed enclosing smaller living cells in food vacuoles and digesting them. What does this observation demonstrate? A. No single cell can digest food B. The ciliate obtains nutrition heterotrophically C. The ciliate must lack…
A membrane allows oxygen to pass directly through its lipid bilayer and a particular ion to pass through channels. Which distinction between these two passive processes is correct? A. Ion movement through a channel must be against its concentration gradient B.…
Compare a bacterial cell with a typical animal cell. Which contrast is valid? A. Only the bacterium has ribosomes B. Only the animal cell contains hereditary DNA C. Both must have a cellulose cell wall D. The animal cell has membrane-bound internal…
Which structural interpretation of this hypothetical protein is correct? A. An intrachain disulfide contributes to tertiary structure, and association of two chains gives quaternary structure B. Every line between successive amino acids is a hydrogen bond C.…
Temperature is held constant while plants are tested at two light intensities. At 0.12% CO₂ under dim light, which change is supported as a way to increase photosynthesis by the results? A. Conclude that no environmental factor limits the rate B. Increase…
During a brief, vigorous sprint, how can a human muscle cell supplement its aerobic ATP supply? A. By releasing oxygen from carbon dioxide B. By ceasing ATP production until oxygen supply catches up C. By forming lactate, allowing rapid glycolytic ATP…
The model pedigree shows a fully penetrant condition caused by a dominant allele. Assume no new mutations. Which observation excludes X-linked dominant inheritance? A. Both sexes occur in the family B. Unaffected V-1 has two unaffected parents C. The affected…
In a model inherited condition, NN individuals have no symptoms, NM individuals have a mild phenotype and MM individuals have a severe phenotype. Two NM parents already have one NN child and one NM child. What is the probability that their next child will have…
Over many generations, what allows a largely self-sustaining forest ecosystem to retain its biological activity? A. Nutrients can be reused only if energy is also recycled B. Elements are recycled while energy is continually supplied and ultimately dissipated…
Under a classification designed to represent evolutionary history, why are several species placed within one genus? A. Every pair must still interbreed successfully B. They must have identical DNA sequences C. They descend from a common ancestral lineage D.…
Two descendant bird lineages evolve different feeding structures. Which statements can explain this divergence? I. Heritable beak variation was available in the ancestral population. II. Beak wear acquired by an individual is necessarily inherited by its…
Which conclusion follows from this cladogram of four hypothetical taxa? A. R and S share a more recent common ancestor than either shares with Q B. P is the living ancestor of every other taxon C. Q and R have no common ancestor D. Every branching interval…
Which pancreatic response helps correct a fall in blood glucose? A. Conversion of its digestive enzymes into glucose receptors B. Greater glucagon secretion C. Greater thyroxine secretion D. Insulin secretion specifically to raise blood glucose
Consider transmission at a cholinergic synapse. Which events normally occur? I. Calcium entry into the presynaptic terminal promotes vesicle exocytosis. II. Acetylcholine crosses the cleft and binds postsynaptic receptors. III. An enzyme breaks down the…
Which set correctly matches three cells found at a lung air sac with their functions? A. Type I: antibody secretion; type II: oxygen transport in blood; phagocyte: surfactant secretion B. Type I: surfactant secretion; type II: engulfing pathogens; phagocyte:…
Which ion movement explains the falling portion of the action potential marked Y? A. Potassium leaves through open potassium channels B. Potassium enters through the channels to make the inside more positive C. A sodium pump switches on only when threshold is…
A sample contains the storage polysaccharides glycogen, amylopectin and amylose. Which monomer is obtained from complete hydrolysis of all three? A. Fructose from glycogen and alpha-glucose from starch B. Alpha-glucose from each C. Beta-glucose from each D.…
What is the immediate role of the sinoatrial node in initiating a normal heartbeat? A. It receives each heartbeat from ventricular muscle and then activates the atria B. It prevents nervous or hormonal adjustment of heart rate C. Its excitation spreads through…
The schematic shows the chambers and major connections of a human heart. What are the functions of the structures labelled X and Y? A. X carries blood high in oxygen to the body; Y prevents backflow from the body into the aorta B. X carries blood low in oxygen…
Which replication task is performed by bacterial DNA polymerase I? A. Replacing RNA primer segments with DNA nucleotides B. Unwinding the parental double helix C. Joining adjacent fragments without adding nucleotides D. Synthesizing the original RNA primer
A short segment of a DNA template strand is written as 5′–AGTC–3′. Which RNA segment is complementary and antiparallel to it? A. 3′–AGTC–5′ B. 3′–UCAG–5′ C. 5′–UCAG–3′ D. 3′–TCAG–5′
A cell synthesizes one enzyme for its cytosol and another protein for secretion. Which ribosomal locations are normally associated with these destinations? A. Both destinations require ribosomes inside lysosomes B. Only ribosomes on membranes can synthesize…
This pathway is controlled by end-product feedback inhibition. Which interaction provides that control? A. Threonine activates every molecule of isoleucine B. Intermediate Q permanently removes all later enzymes C. E5 inhibits threonine only after threonine…
Which feature is shared by the Krebs cycle and the Calvin cycle? A. Both include a reduction step B. Both have ATP as their main net product C. Both consist entirely of breakdown reactions D. Both occur in the mitochondrial matrix
Which statement about chemiosmotic ATP synthesis is correct? A. ATP synthase makes ATP by pumping protons uphill without an energy source B. It occurs across inner mitochondrial membranes and thylakoid membranes C. Its immediate driving force is diffusion of…
Which proposed features describe mature phloem sieve-tube elements? I. Perforated end walls permit sap movement between adjacent elements. II. Each mature element retains a large nucleus controlling its metabolism. III. The wall is lignified like a xylem…
How can auxin contribute to a plant’s growth response? A. By permanently preventing cell-wall expansion B. By preventing responses to directional light C. By making all plant organs grow at an identical rate D. By regulating growth associated with the shoot…
A measured pigment trait varies continuously from very pale to very dark in a population, rather than falling into a few distinct classes. Which genetic explanation is most consistent with this observation? A. Contributions from multiple genes B. Only one…
A person encounters a particular pathogen for the first time. Which event is part of the specific immune response? A. The pathogen’s antigen automatically becomes a vaccine inside each cell B. Recognition of its antigens leads to B-cell activation and…
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