Zadanie 1a
(i) State the independent variable. (ii) Outline why using pieces of similar size and shape makes the results more reliable.
- Materiał graficzny
Biology HL Paper 1B, Specimen 2025
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 16 zadań z tego arkusza, razem 35 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Reciprocal benefits in mutualistic partnerships (3), Interpreting Chargaff's base measurements (3).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Suggest why the mass changes are expressed as percentages.
- Materiał graficzny
Zadanie 1c
Explain how immersion in the solution containing no sucrose affects the tissue’s water potential.
- Materiał graficzny
Zadanie 2a
Suggest why the amino acids carry a radioactive label.
- Materiał graficzny
Zadanie 2b
(i) Identify X. (ii) Explain the role of the ribosomes associated with X. (iii) Outline evidence that molecules containing the labelled amino acids move from X to the Golgi apparatus.
- Materiał graficzny
Zadanie 2c
Suggest why a fluid-secreting gland cell may have many aquaporins in its plasma membrane.
- Materiał graficzny
Zadanie 2d
Explain how a globular protein’s amino-acid sequence is related to its tertiary structure.
- Materiał graficzny
Zadanie 3a
Outline mutualism using this association as an example.
- Materiał graficzny
Zadanie 3b
Distinguish the bacterial cells from cells of the lupin plant.
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Zadanie 3c
Suggest why mutualism frequently involves organisms from distantly related groups.
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Zadanie 3d
Analyse the results shown in the graph.
- Materiał graficzny
Zadanie 4a
State one purine found in DNA.
Zadanie 4b
Explain how the measurements challenge the equal-four-base hypothesis.
Zadanie 4c
Using the data, evaluate the claim that the purine:pyrimidine ratio is 1.00 in all organisms.
Zadanie 4d
Discuss how the results are consistent with a last universal common ancestor.
Zadanie 4e
Discuss evidence concerning the relationship between genome size and organismal complexity.