Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 39 zadań z tego arkusza, razem 39 punktów, każde z kluczem i schematem punktowania.
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuWhich features belong to an ordinary double-stranded DNA molecule? I. Opposite strands show complementary pairing. II. Its nucleotides contain deoxyribose. III. Thymine is one of its bases. A. II only B. I and III only C. I, II and III D. I and II only
Water delivered to early Earth could have remained as vapour or formed oceans. Which condition helped retain it at the surface? A. Surface cooling made condensation possible B. All atmospheric gases permanently bonded to water C. Earth ceased receiving solar…
A nutrition table classifies leucine and threonine as essential, and alanine and glutamate as non-essential. Which conclusion follows for a healthy adult? A. Alanine is absent from proteins B. Threonine needs a dietary supply C. Leucine is synthesized in…
A steroid hormone has a largely non-polar fused-ring skeleton. Which route allows it to enter a target cell? A. Diffusion through the phospholipid bilayer B. Passage through a sodium-selective channel C. Movement exclusively through a water-filled pore D.…
In an oxygen-limited muscle fibre, pyruvate + NADH + H⁺ → lactate + NAD⁺. What is the main benefit of this reaction? A. It converts lactate directly into ATP B. It supplies oxygen to cytochrome oxidase C. It returns NAD⁺ so glycolysis can continue releasing…
Protease solutions were tested on identical milk-protein stains for45minutes. Residual colour score runs from1(faintest) to6(darkest). Temperature / °C | 12 | 22 | 32 | 42 | 62 Residual score | 5 | 4 | 2 | 1 | 6 Which explanation is consistent with the…
A leaf is darkened at2minutes. Which change explains the model metabolite curves? A. Less ATP and NADPH are available for GP reduction B. GP is made from ATP by the light reactions C. Rubisco can bind carbon dioxide only when struck directly by light D. The…
Two sealed seed chambers have identical starting conditions. The seeds consume carbohydrate, so oxygen uptake approximately matches carbon-dioxide release. Which marker movements are expected at constant temperature and pressure? A. Both: right B. P:…
What consequence follows from several codons specifying the same amino acid? A. Some substitutions leave the amino-acid sequence unchanged B. Every codon specifies several amino acids C. A ribosome can translate a codon without tRNA D. Every substitution…
Why does a PCR protocol use two designed DNA primers? A. They identify the ends of the target and provide sites for extension B. They digest all DNA outside the target C. They prevent complementary strands from ever pairing D. They replace the proofreading…
Researchers make mice lacking a functional tumour-suppressor gene. Which use of this model is appropriate? A. Testing a candidate treatment against tumours developing in the model B. Obtaining an intact copy of the deleted gene from those cells C. Proving that…
Which shared feature makes mature mammalian erythrocytes and angiosperm sieve-tube elements atypical eukaryotic cells? A. No cytoplasm B. A peptidoglycan wall C. No plasma membrane D. Absence of a nucleus
Which component is present in the standard cellular-biology model of every virus? A. A mitochondrion B. A ribosomal cytoplasm C. A protein capsid D. A phospholipid envelope
The diagram shows several products of one adult stem-cell lineage. Which classification and location fit the cell? A. Totipotent; circulating plasma B. Multipotent; bone marrow C. Totipotent; bone marrow D. Pluripotent; mature erythrocyte
A cell adjusts its membrane lipids during sustained cold conditions. Which change helps maintain fluidity without requiring a change in protein abundance? A. More peptide bonds in phospholipids B. Replacement of all phospholipids by cellulose C. More saturated…
Which property of the nuclear envelope assists chromosome segregation during open mitosis? A. Its phospholipid tails attract cytosolic water B. Its two membranes prevent any membrane remodelling C. Its pores export whole chromosomes to ribosomes D. Its…
A culture of luminous bacteria begins emitting light only after reaching a threshold cell density. What mechanism best explains this? A. Accumulated bacterial signals activate light-production genes in the bacteria B. Only one cell detects light and becomes a…
Myelinated fibres X,Y,Z conduct at6,45 and95m/s respectively. Which hypothesis could explain Z’s higher speed? A. Z has a much longer total axon B. Z has a larger axon diameter C. Z has the smallest diameter D. Z lacks nodes of Ranvier
Arrange these events in a cell undergoing meiosis. P: homologues separate Q: DNA is replicated R: homologues pair S: crossing over occurs A. P→R→Q→S B. Q→S→P→R C. Q→R→S→P D. R→Q→P→S
A nuclease breaks down a particular mRNA molecule. What is the direct consequence? A. Its gene is removed from DNA B. Its ribosome becomes a lysosome C. Transcription of every gene stops D. That mRNA can no longer serve as an intact template for translation
Which molecular comparisons were central to recognition of the three cellular domains? A. Ribosomal RNA sequences B. Mitochondrial genes in bacteria C. Haemoglobin sequences from all organisms D. Cellulose sequences
Two members of one species differ at a single-nucleotide polymorphism. What must differ? A. Their chromosome numbers B. Their number of ribosomes C. Their genomic DNA sequence D. Every protein they produce
A mutation disrupts the elastic function of titin. Which muscle problem is most directly expected? A. Actin can no longer contain amino acids B. All tendons disappear C. The muscle loses every mitochondrion D. Sarcomeres become more vulnerable to excessive…
An erythrocyte has delivered oxygen to a hand. In what order does it subsequently pass the labelled locations before entering the aorta? A. Q→P→S→R B. P→Q→R→S C. S→R→Q→P D. R→S→P→Q
Which event initiates a specific antibody-producing response? A. Activation of a matching B cell by antigen and helper-T-cell signals B. Contraction of a skeletal muscle C. Conversion of fibrinogen into fibrin D. Release of hydrochloric acid in the stomach
Which environmental change normally favours increased pineal melatonin secretion? A. A rise in dietary calcium B. An increase in blood glucose C. The transition to darkness D. A loud sound at noon
In a withdrawal reflex, where would a sensory neuron synapse with a relay neuron in the spinal cord? A. R B. Q C. S D. P
Which arrangement most strongly requires pollen transfer between different plants? A. Pollen lands on the stigma of its own flower B. Male and female flowers occur on separate individuals C. Anthers and stigmas mature together in one flower D. A flower…
Which feature distinguishes human oogenesis from spermatogenesis? A. Meiotic cytokinesis partitions cytoplasm unequally B. It produces four equal functional gametes per primary cell C. It never includes meiosis D. Its final cells are diploid
Cold exposure increases activity in adult brown adipose tissue. How does this tissue generate heat? A. It converts every fat cell into an insulating keratin layer B. It oxidizes stored fuel while uncoupling much of respiration from ATP synthesis C. It…
Genetically matched butterfly larvae develop different adult wing pigmentation when reared at18°C and27°C. The response is phenotypic plasticity. Which explanation fits? A. The two groups must belong to different species B. Temperature alters expression of…
What combination characterizes analogous features such as insect and bird wings as flight structures? A. Same origin; no present function B. Same origin; necessarily different function C. Different origin; necessarily unrelated function D. Independent…
Which pair of human activities could best account for the change in these model land-cover maps? A. Natural regeneration and planting native trees B. Timber clearance and conversion to crop plantations C. Rewilding and forest restoration D. Afforestation and…
Which labelled organism is a mixotroph according to the energy-flow diagram? A. Grazer Z B. Organism X C. Bacteria D. Organism Y
Which situation is an example of top-down population control? A. Grazing snails reduce the abundance of algae B. Rainfall limits the growth of grasses C. Algae supply more food and increase snail abundance D. Phosphate availability limits algal growth
The diagram is a pyramid of energy. Which reading is valid? A. Producers reflect exactly19200units of incoming sunlight B. The36units belong to decomposers at every level C. Primary consumers receive4800kJ m⁻² year⁻¹ D. Secondary consumers receive4800units
At a two-allele locus in Hardy–Weinberg equilibrium, the dominant allele frequency is0.65. What fraction is expected to show the recessive phenotype? A. 0.4225 B. 0.1225 C. 0.35 D. 0.455
Which project investigates phenology? A. Comparing chromosome counts among mammals B. Measuring the mass of DNA in a nucleus C. Identifying enzymes in a leaf extract D. Recording the first flowering date of a shrub each spring
Repeated nitrate runoff stimulates a lake algal bloom, followed by increased decomposition. What is expected? A. Greater biochemical oxygen demand B. Immediate disappearance of all decomposers C. Conversion of nitrates into persistent plastic D. A universal…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.