Recognize the ring framework of steroids and relate non-polarity to movement through lipid membranes.
Tę umiejętność sprawdzają 4 zadania wzorowane na arkuszach IB z lat 2025–2026.
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…
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…
Which substance–route pairing correctly describes movement through a cell membrane? A. Testosterone — directly through the lipid bilayer B. Starch — through an aquaporin C. A sodium ion — freely through the hydrophobic core D. A large antibody — through a…
A steroid hormone has a largely non-polar fused-ring skeleton. Which route allows it to enter a target cell? A. Diffusion through the phospholipid bilayer B. Passage through a sodium-selective channel C. Movement exclusively through a water-filled pore D.…
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