Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 26 zadań z tego arkusza, razem 26 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Assembling glycerol-based lipids (2), Representing an amino acid (2).
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Dodaj cały arkusz do zestawuAnalysis detects the following elements in two purified biological molecules. Which identification is consistent with both sets? Sample | Detected elements R | C, H, O, P S | C, H, O, N Assume each sample is one of the ordinary molecules listed. A. R: starch;…
A small pond insect rests on the surface without breaking through it. Which property of water most directly supports this behaviour? A. Its complete inability to interact with charged substances B. Its higher density as ice than as liquid C. Its low resistance…
A lipase preparation completely hydrolyses one molecule of a neutral storage fat containing three ester bonds. What is released? A. Three glycerol molecules and one fatty acid B. A glycerol molecule and three fatty acids C. Three amino acids and a phosphate…
Which outlined region contains the part of this amino acid that varies among the standard amino acids? A. Region R B. Region P C. Region S D. Region Q
Which statement applies to an enzyme while it catalyses its reaction? A. It interacts with a substrate during the catalytic cycle B. It must be exported in a secretory vesicle before acting C. It permanently becomes part of the reaction product D. It increases…
Which statement correctly distinguishes complete aerobic glucose breakdown from lactate fermentation in human cells? A. Aerobic breakdown generates carbon dioxide, whereas lactate fermentation does not B. Lactate fermentation requires oxygen as the terminal…
A PCR protocol repeatedly heats DNA to separate its strands. Why can a heat-stable bacterial DNA polymerase remain useful through many cycles? A. It prevents the DNA strands from separating B. It replaces the need for a template strand C. It produces the…
A DNA segment changes from GGA TCA AAC GTT to GGA TGA AAC GTT. Which type of change occurred? A. A whole chromosome was duplicated B. One nucleotide was inserted without replacement C. One base was replaced by another D. Three nucleotides were deleted
Which description fits a mature functioning sieve-tube element in an angiosperm? A. A dead hollow cell whose wall is heavily lignified B. A living cell containing cytoplasm but lacking a nucleus C. A cell filled mainly by many chloroplasts and a large nucleus…
Which description is supported by the membrane drawing? A. A peripheral protein found only on the cytoplasmic surface B. A soluble carbohydrate floating freely inside the cell C. A membrane-spanning glycoprotein that may participate in recognition D. A channel…
A neuron uses ATP to maintain the ion concentration differences associated with its resting potential. Which movement is produced by the sodium–potassium pump? A. Both sodium and potassium move into the neuron B. Sodium moves out and potassium moves in C.…
What role do histone proteins play in a eukaryotic chromosome? A. They supply the catalytic centre of a ribosome B. They join amino acids during translation C. They form the spindle fibres that pull chromosomes apart D. They help package DNA into chromatin
Which term denotes the complete set of genetic information in an organism? A. A phenotype B. A gene pool shared by a population C. An individual allele D. A genome
Which statements apply to gas exchange in healthy mammalian lungs? I. Gases cross a moist exchange surface. II. Ventilation helps maintain the gradients driving diffusion. III. Breathing can remove water vapour from the body. A. I and II only B. II and III…
Water evaporates from mesophyll cell walls while roots have an adequate water supply. Which process helps replace the lost water? A. Upward bulk flow through xylem driven by transpiration pull B. Permanent closure of every stoma before any water is lost C.…
Which type of neuron carries an efferent signal from the central nervous system towards a gland acting as an effector? A. A motor neuron B. A sensory neuron carrying signals into the spinal cord C. A receptor cell confined to the retina D. A relay neuron…
Which cell contributes directly to innate defence by engulfing invading bacteria? A. An antibody-secreting plasma cell B. A memory B lymphocyte C. A neutrophil D. An antigen-specific cytotoxic T cell
After body temperature rises above the regulated range, which response and feedback classification are appropriate? A. Negative feedback: increased skin blood flow promotes heat loss B. Positive feedback: shivering reduces heat production C. Negative feedback:…
In a model 28-day ovarian cycle, ovulation occurs on day 14. Which structure develops from the ruptured follicle shortly afterwards? A. A placenta B. A second ovary C. A new oviduct D. A corpus luteum
Distantly related aquatic vertebrates independently evolve a streamlined body shape. Which process accounts for these analogous features? A. Random conversion of all acquired traits into inherited alleles B. Convergent evolution under similar functional…
Four model aquatic invertebrates feed on the same suspended food. Their preferred temperature ranges are shown. Which conclusions about this niche dimension are justified? Species | Preferred temperature / °C W | 14–17 X | 12–25 Y | 17–21 Z | 20–29 I. All four…
Which description correctly identifies a nutritional strategy? A. A photoautotroph obtains all its carbon by ingesting other organisms B. A saprotroph must use sunlight to fix carbon dioxide C. A mixotroph can combine photosynthesis with uptake of organic food…
Which role does the snail occupy in the chain? A. Herbivore feeding on a producer B. Predator feeding on the duck C. Photosynthetic primary producer D. Decomposer feeding only on dead animals
Roots of one plant release a compound that suppresses the growth of neighbouring plants of another species. What is this chemical interaction called? A. Allelopathy B. Cooperative hunting C. Obligate mutualism D. Parasitic ingestion
Which event is most clearly a density-independent cause of mortality in a small mammal population? A. Increased competition for burrows as numbers rise B. More rapid spread of infection at high density C. A sudden volcanic ash fall that buries the habitat D. A…
Over generations, individuals with a heritable trait leave more offspring, and the trait becomes more common. What is the resulting population-level change? A. Every individual has deliberately adapted its genes B. All genetic variation must disappear…
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