Umiejętności z tego działu sprawdza 36 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 27 z 54 arkuszy w bazie.
Two purified triglyceride mixtures have fatty acid chains of similar length. Mixture X contains many cis double bonds and melts below mixture Y. Which explanation is consistent with this result? A. The double bonds make X a polymer of glycerol B. Kinks in the…
The ring framework of a signalling molecule is shown. Which description best predicts its behaviour at a cell membrane? A. It is a steroid with a largely non-polar framework that can cross the bilayer B. It is a polysaccharide whose rings require a sodium…
Two fatty acids are represented by condensed structural formulae; the double bond in Q is cis. P: CH3(CH2)14COOH Q: CH3(CH2)5CH=CH(CH2)7COOH Which comparison is most likely? A. Q packs more tightly because its cis bond…
Carbon chemistry underlies the origin, storage and sustainable production of biological material. (a) Outline environmental conditions on early Earth that favoured diverse carbon compounds. (b) Describe practices that can make agriculture sustainable. (c)…
Glucose connects molecular structure, energy release and physiological regulation. (a) Distinguish alpha-glucose and beta-glucose in structure and biological role. (b) Explain the regulation that prevents large sustained changes in human blood glucose…
Four molecular structures are shown. Which has distinct water-attracting and water-repelling regions and is therefore amphipathic? A. Molecule D B. Molecule B C. Molecule C D. Molecule A
A plant cell deposits cellulose microfibrils outside its plasma membrane. What is their principal contribution? A. They catalyse respiration in the mitochondria B. They store the cell’s genetic information C. They resist stretching and reinforce the cell wall…
The structural formula of molecule M is shown. Which description best fits its structure? A. A steroid lipid that can diffuse through a phospholipid bilayer B. A triglyceride containing three long fatty-acid chains C. A water-soluble monosaccharide with a…
(i) Distinguish the blubber proportions of the two age classes across the seasons. (ii) Suggest reasons for this difference.
Explain possible reasons for the seasonal differences in body mass.
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