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 85 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Chemical feedback adjusting breathing (3), Constructing trees from sequence comparisons (3), Leaf structures supporting gas exchange (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuResearchers introduce plasmids into cultured mammalian follicle cells. One plasmid contains a candidate regulatory gene R. A second uses the same vector backbone but lacks R. All other treatment steps are identical. Identify the control treatment.
(i) Outline one physiological response that could lower the runner’s body temperature. (ii) Identify the type of feedback involved and give a reason.
Explain how combustion of fossil fuels can raise global mean temperature.
Polar warming melts reflective ice and exposes darker surfaces. Identify the feedback type, giving a reason.
Identify the nucleic acid represented.
Determine whether this is transcription or replication, giving a reason from the newly assembled strand.
Deduce the base represented by X.
Identify the terminal marked Y.
(i) Identify the bond type indicated by Z. (ii) Explain how two enzymes form this type of bond while DNA is copied.
State how ventilation changes as arterial pH decreases.
Outline how arterial pH is monitored.
Explain the main cause of blood pH changes during ordinary variation in metabolic activity and ventilation.
State the two principal muscle groups that contract more strongly or more often to raise inspired air volume per minute.
State the ecological term for all the balsam individuals of this species living in one area.
Suggest two ways dense balsam stands could suppress other plants.
Identify the interaction between balsam and (i) the nectar-collecting bees, and (ii) the insects eating its leaves.
Suggest a function of the upper epidermis and a function of the palisade mesophyll.
Explain how two leaf structures assist gas exchange.
State the functions of xylem and phloem in the leaf.
Outline the meanings of root and node in a cladogram.
Discuss using protein amino-acid sequences to construct cladograms.
Identify another type of evidence suitable for constructing a cladogram.
Outline how parsimony is used to choose among candidate cladograms.
A flowering plant can reproduce sexually or form new individuals by vegetative growth. (a) Explain why both meiosis and gamete fusion are needed in a sexual life cycle. (b) Describe how interphase and mitosis preserve chromosome number during vegetative…
A eukaryotic cell depends on membranes to organize reactions, exchange materials and respond to signals. (a) Discuss the benefits of membrane-bound compartments. (b) Describe mechanisms that move materials across the cell boundary. (c) Explain how axon…
Plant and animal cells use ATP while obtaining energy through different processes. (a) Explain why ATP is suited to transferring energy within cells. (b) Describe how light energy drives ATP formation in a plant cell. (c) Compare and contrast how types of…
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