Umiejętności z tego działu sprawdza 50 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 34 z 57 arkuszy w bazie.
A digestive enzyme breaks the chain shown into smaller units. What does water contribute to the hydrolysis reaction? A. It provides an H and an OH that become attached to the separated products B. It supplies ATP directly from its oxygen atom C. It permanently…
Three model fatty acids have equal carbon-chain lengths but differ in saturation or double-bond geometry. Which structure best explains the high melting point of X? A. Several cis carbon–carbon double bonds interrupt its chain B. Its carbon chain contains no…
Which property is shared by starch and cellulose in plant cells? A. Both consist exclusively of branched beta-glucose chains B. Both are the main energy-storage polymer of the cell wall C. Their large polymer molecules are poorly soluble in water D. Both are…
Outline one property of monosaccharides and a biological function supported by that property.
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…
Living systems display diversity from molecules to communities. (a) Outline how the structures of starch and cellulose support their functions. (b) Describe adaptations through which forest plants obtain light. (c) Explain how natural selection brings about…
A membrane’s molecular organization underlies selective transport and electrical properties. (a) Outline phospholipid structure and its interactions with water. (b) Explain how proteins enable substances to cross membranes. (c) Describe the establishment of a…
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…
Identify the reaction type that forms the ester linkage marked X.
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