Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 36 zadań z tego arkusza, razem 36 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Evaluating biological evidence and methods (3).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuWhich conclusion follows from the observations of two cells? Feature | Cell R | Cell S Ribosomes | present | present Membrane-bound nucleus | present | absent Cell wall | absent | present Mitochondria | present | absent Chloroplasts | absent | absent A. R is a…
What is a major effect of cholesterol within a mammalian plasma membrane? A. It converts the bilayer into a water-soluble layer B. It moderates membrane fluidity across temperature changes C. It actively pumps ions through the hydrophobic core D. It sets the…
Which structure could have provided a boundary around the earliest cell-like systems before mitochondria and chloroplasts evolved? A. A cellulose wall containing plasmodesmata B. A membrane enclosing a compartment C. A fully developed chloroplast envelope D. A…
During which labelled phase is nuclear DNA replicated before cell division? A. M B. G2 C. G1 D. S
An enzyme is tested only at pH 6.5. What can be predicted about its activity if the temperature series is repeated at pH 7.5? A. Every rate must double B. The optimum temperature must become 10°C higher C. The supplied results do not establish the pH response…
A DNA molecule contains 360 guanine nucleotides, which are 30% of all its nucleotides. Assuming one phosphate per nucleotide, how many phosphate groups does it contain? A. 108 B. 720 C. 1200 D. 1560
Which numerical relationship illustrates degeneracy in the standard genetic code? A. There are fewer codons than the four nucleotide types B. There are more sense codons than encoded amino-acid types C. Every codon specifies two different amino acids at once…
Which explanation is consistent with the rise shown in this exercise model? A. Increasing reliance on lactate-forming pathways can exceed lactate clearance B. Complete absence of oxygen must occur throughout the body C. Lactate production always stops at high…
At 320 µL L⁻¹ CO₂ on the low-illumination curve, which factor is shown to limit the rate? Temperature is held constant. A. Carbon dioxide alone, because adding more immediately increases that curve B. Light availability, because stronger illumination increases…
The following rounded gene counts are illustrative estimates. Which interpretation is justified? Organism | Approximate gene count Bacterium | 4100 Yeast | 6100 Nematode | 20000 Mouse | 22000 Flowering plant | 31000 Human | 21000 A. The plant must produce…
Which statement correctly describes chromosome content in a typical mature human egg? A. It contains 44 autosomes and no sex chromosome B. It contains 23 pairs of autosomes C. It contains 22 autosomes and one X chromosome D. It contains one Y chromosome and…
Which event distinguishes meiosis I from an ordinary mitotic division? A. DNA was replicated before division B. Spindle fibres attach to chromosomes C. Chromosomes move along a spindle D. Homologous chromosomes separate from one another
A fully penetrant autosomal dominant condition is caused by allele D. Two heterozygous parents are Dd. What is the chance that a child inherits the condition? A. One quarter B. One half C. Three quarters D. All children
Water fleas feed on algae, small fish eat water fleas, and herons eat the fish. Which energy pyramid has the correct trophic order and relative energy availability? A. Pyramid A B. Pyramid B C. Pyramid C D. Pyramid D
Which processes can transfer carbon along X and Y? A. X: photosynthesis; Y: burial B. X: respiration; Y: combustion C. X: feeding; Y: photosynthesis D. X: fossil formation; Y: nitrogen fixation
Which change can occur as the climate warms? A. Every ocean current must retain exactly its former pattern B. Seawater necessarily becomes more alkaline because it is warmer C. Circulation changes can alter ocean nutrient upwelling D. All tropical storms must…
Which observations can support evolutionary change? I. Heritable changes achieved by selecting crop varieties. II. Successive fossil assemblages with differing organisms. III. Similar underlying limb structures in different vertebrates. A. I only B. II and III…
Which explanation is consistent with the trend in this constructed bacterial dataset? A. The antibiotic gives every bacterium an inherited need to resist it B. Resistance means that bacteria have human-like acquired immunity C. Resistant variants can survive…
Five species have the character states below. Assume each derived character arose once without subsequent loss. Which cladogram fits these data? Species | Trait 1 | Trait 2 | Trait 3 | Trait 4 | Trait 5 U | absent | absent | absent | absent | absent V |…
Which combination could contribute to the rise during the first six minutes and the fall during the final six minutes? A. Early adrenaline release; later brainstem autonomic signals slowing the heart B. Early disappearance of all blood flow to the lungs; later…
What is a role of fibrin in forming a blood clot? A. It converts all platelets into red blood cells B. It forms an insoluble network retaining cells and platelets C. It dissolves the injured vessel wall D. It acts as a hormone that raises blood glucose
An alveolar cell contains abundant organelles associated with secretion. Which identification is most consistent with this observation? A. An erythrocyte B. A type I pneumocyte with no secretory activity C. A type II pneumocyte producing surfactant D. A neuron…
What is a function of the structure labelled X? A. It increases conduction speed along the axon B. It is the site where every neurotransmitter is released C. It contains the nucleus for the entire neuron D. It reverses the direction of every action potential
Which row identifies X, the short newly synthesized segment Y and the end Z? A. X: 3′; Y: continuous leading strand; Z: 5′ B. X: 5′; Y: Okazaki fragment; Z: 3′ C. X: 5′; Y: RNA chromosome; Z: 5′ D. X: 3′; Y: Okazaki fragment; Z: 5′
What happens during splicing of a typical eukaryotic pre-mRNA? A. The RNA is converted into a double-stranded chromosome B. Exons are removed and all introns become codons C. Retained exons are joined after intron removal D. DNA primers are permanently…
A template-DNA segment is read as 3′–TTC GGA–5′. Which pair gives the corresponding tRNA anticodons, each written 3′ to 5′? A. TTC and GGA B. AAG and CCU C. UUC and GGA D. CUU and AGG
Which assignment best fits the curves? A. P: competitive; Q: no inhibition B. P: pure non-competitive; Q: competitive C. P: no inhibition; Q: pure non-competitive D. P: competitive; Q: pure non-competitive
Which labelled region is the site of pyruvate conversion to acetyl coenzyme A in a typical aerobic eukaryotic cell? A. P B. Q C. R D. S
Which pair supplies energy and reducing power from the light-dependent reactions to carbon fixation? A. Oxygen and carbon dioxide B. ATP and reduced NADP C. Water and ADP D. Glucose and oxidized NADP
With other conditions held constant, which sketch best represents the usual effect of higher air humidity on transpiration? A. Sketch A B. Sketch B C. Sketch C D. Sketch D
In these schematic dicot sections, which pair of labels points to xylem? A. P and S B. Q and S C. P and R D. Q and R
Which feature permits a plant shoot to continue producing new organs over an extended period? A. All cells at the shoot tip permanently lose the ability to divide B. A meristem retains cells capable of repeated division C. Every mature leaf becomes an…
A plant normally has two complete chromosome sets. A new individual has four complete sets in each somatic cell. Which term describes this change? A. A single-base substitution B. Monosomy C. Polyploidy D. Loss of a nucleolus
A double heterozygote has linked alleles in the arrangement RS/rs and is test-crossed with rs/rs. Which offspring genotypes arise from recombinant gametes of the heterozygote? A. RS/rs and rs/rs B. Rs/rs and rS/rs C. RR/ss and SS/rr D. RS/RS and rs/rs
Which event helps prevent additional sperm from entering an egg after one sperm has fused with it? A. Release of cortical-granule contents that alters the egg coverings B. Production of a polar body before fertilization alone C. Formation of the sperm tail D.…
Where is filtered glucose normally reabsorbed into the blood, and which transport principle contributes to its uptake from the tubule lumen? A. Glomerulus; formation of filtrate alone B. Collecting duct; evaporation C. Proximal convoluted tubule; sodium-linked…
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