Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 20 zadań z tego arkusza, razem 20 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Generating the variation available to selection (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuAs an embryo develops, cells with the same genome become different tissue types. Which process helps produce these differences? A. Different subsets of genes are expressed in different cells B. Each tissue necessarily replaces its DNA with an unrelated genome…
Which 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
Which process and biological use fit the sequence? A. Endocytosis used to ingest particles by a unicellular organism B. Exocytosis used to release a hormone from a secretory cell C. Facilitated diffusion used to import individual ions D. Osmosis used to take…
Two monosaccharide residues are represented by R and R′. Their linkage forms as shown: R–OH + HO–R′ → R–O–R′ + H₂O Which description fits this change? A. A disaccharide linkage forms by condensation B. A glycosidic bond is broken by hydrolysis C. Two peptide…
Why does binding oxygen to haemoglobin increase the oxygen-carrying capacity of blood compared with plasma alone? A. Non-polar oxygen dissolves only sparingly in the aqueous plasma B. Haemoglobin makes oxygen substantially more soluble in the water of the…
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
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
Which pairing correctly matches each polymerase to its principal process? A. RNA polymerase: transcription; DNA polymerase: DNA replication B. RNA polymerase: peptide assembly; DNA polymerase: transcription C. RNA polymerase: translation; DNA polymerase: DNA…
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…
Which mechanism helps explain how prolonged exposure to cigarette smoke can raise cancer risk? A. Mutagenic compounds can alter DNA sequences in somatic cells B. Smoke causes cancer mainly by increasing the frequency of mutations in gametes C. Nicotine…
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 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 radiation emitted by Earth is absorbed by greenhouse gases such as carbon dioxide and methane? A. Long-wave infrared radiation B. Short-wave ultraviolet radiation only C. Visible green light only D. Short-wave ultraviolet radiation reflected from the…
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…
A plant population expands mainly through genetically identical clonal offspring. Why might adaptation to a new selective pressure be slower than in a comparable sexually reproducing population? A. Cloning produces little new genetic variation apart from…
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…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.