Q) Describe the usefulness of phospholipids in living organisms
| Main points | |
| Key idea: | Main component of cell membranes |
| · Amphipathic property of phospholipid · Ref to a polar head + 2 non-polar hydrocarbon tails · Result: mol arrange to form a bilayer struc · Ref to polar heads pointing towards aq medium; hydrocarbon tails form hydrophobic core · Ref to bilayer struc forming cell surface membr + compartmentalize cell throu formation of membrane-bound organelles (where specialized rx can take place w/n) | |
| Key idea: | Regulates passage of substances in and out of cell |
| · Ref to hydrophobic core of bilayer excludes large polar substances + charged particles/ions fr passing throu by simple diffusion | |
| Key idea: | Good thermal insulator + provides buoyancy |
| · Prevents excessive heat loss + less dense than water · Ref to its usefulness to animals (e.g. whale) that live in cold environment + aquatic mammals (e.g. whales and seals) | |
| Comments: (i) Visualize the answer with the aid of a labelled diagram. (ii) Verbalize the answer + write down the main points w/o referring to the answer (use abbreviations) (iii) Read again within the next 24h & once more within 72h (do not spend more than 10min) | |
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