Zadanie 1d, Paper 2, listopad 2023, TZ1, Biologia IB HL

Informacja do zadań 1 a-1 h.

All values are constructed for a model investigation of mammalian metabolism. At steady state, a circulating metabolite enters the blood at the same rate as it is removed, so its concentration can remain stable despite continuous turnover. Turnover flux is the amount entering and leaving the circulating pool per unit body mass and time.

The table describes animals after a period without food. Alanine, glutamine and glycine are amino acids.

Separate groups are compared while fasting and while feeding. The scatter plot displays individual measurements and group means.

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Labelled metabolites were also traced into intermediates of the Krebs cycle. The stacked bars show the fraction of carbon input attributable to each of three circulating metabolites in ten tissues. Fractions below 1 leave a contribution from other sources.

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Zadanie 1 d.

Outline how turnover fluxes change when the animals move from fasting to feeding.