Zadanie 1a
State the lane number for the control lacking template DNA.
- Materiał graficzny
Biology HL Paper 3, November 2023, TZ2
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 43 zadania z tego arkusza, razem 77 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Recording and interpreting biological data (14), Evaluating biological evidence and methods (10), Amplifying DNA and separating fragments (5).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuZadanie 1b
Deduce whether the primers are shorter or longer than the amplified DNA, giving a reason.
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Zadanie 1c
Explain why the temperature changes within each cycle.
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Zadanie 1d
Predict the result if fewer cycles are completed.
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Zadanie 2a
Explain why a standard-deviation error bar cannot be calculated from the single m2-with-salt observation.
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Zadanie 2b
State one environmental variable that should be held constant.
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Zadanie 2c
Evaluate the contribution of proteins1 and2 to salt tolerance using the results.
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Zadanie 3
The schematic shows ribosomes associated with one mRNA molecule. Identify which marked position, R or S, is closer to the start codon, giving a reason.
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Zadanie 5a
A lateral schematic of a mammalian brain is shown. On the diagram, label the cerebellum.
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Zadanie 5b
Constructed MRI measurements compare eight primate species. Letters identify species ordered from lowest to highest body mass. Bars show means and standard deviations. Analyse the relationship between body mass and cerebellum volume.
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Zadanie 6
The schematic shows part of a chemical synapse. Label (i) one neurotransmitter receptor and (ii) the presynaptic membrane.
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Zadanie 7
Two groups of migratory songbirds normally use different routes. In a constructed experiment, their eggs hatch in captivity and the young are reared without parental contact or exposure to migrating adults. During their first migratory season, each bird’s…
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Zadanie 8
In a model experiment, odorant is applied either to the cilia or to the main body of an olfactory receptor cell at time zero. Distinguish between the two current responses.
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Zadanie 10a
Identify the strain with the lowest antibiotic resistance.
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Zadanie 10b
State one reason for incubating the plates before recording the results.
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Zadanie 10c
Suggest why strain B7 grows at the different antibiotic concentrations.
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Zadanie 10d
Distinguish between this method and an antibiotic-disc inhibition-zone test, referring to antibiotic placement and measurement of its effect.
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Zadanie 11a
State the relationship between divergence time and sequence differences.
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Zadanie 11b
Outline how a computer-assisted method can compare the nucleotide sequences.
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Zadanie 12a
State which part of a virus is recognized by the bound antibody.
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Zadanie 12b
State one technique that can detect viral genetic material.
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Zadanie 13
Bacteria in a biofilm interact with neighbouring cells. State one property that can emerge from these interactions.
Zadanie 16a
Identify the whelk’s largest source of dietary energy.
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Zadanie 16b
State the trophic level occupied by limpets.
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Zadanie 16c
Predict the likely effects of (i) removing mussels on sea stars, and (ii) removing barnacles on the community.
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Zadanie 16d
Explain why the sea star can be regarded as a keystone species.
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Zadanie 17a
Identify the curve most likely to represent stonefly nymphs.
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Zadanie 17b
Outline how indicator organisms such as stoneflies can be used to assess water quality.
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Zadanie 17c
Explain how eutrophication affects biochemical oxygen demand.
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Zadanie 18a
Label two growth phases on the nutrient-solution curve.
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Zadanie 18b
Compare the two growth curves.
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Zadanie 18c
Suggest two factors that could limit growth once biomass has reached a plateau.
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Zadanie 19a
State one process by which phosphate can move from farmland into a river.
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Zadanie 19b
Outline why phosphate availability might limit agriculture in the future.
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Zadanie 20
An organism introduced beyond its native range can alter an established ecosystem. Discuss possible ecological effects of an introduced species, including one named example.
Zadanie 22
Liver cells (hepatocytes) exchange substances with blood in adjacent sinusoids. Some substances are detoxified inside the cells before the resulting products are transported elsewhere. Draw arrows showing (i) the movement of oxygen to a hepatocyte, and (ii)…
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Zadanie 23a
State the relationship between the two measured variables.
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Zadanie 23b
Explain how peptide hormones act on target cells.
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Zadanie 23c
State what makes the ADH-releasing part of the pituitary an endocrine gland.
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Zadanie 24a
Suggest one reason why the proportion of coronary heart disease could differ between these groups.
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Zadanie 24b
Outline contributing causes of hypertension.
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Zadanie 25a
State the relationship shown.
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Zadanie 25b
Explain effects of high altitude on gas exchange and oxygen supply.
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