Q) Lipids is a better energy storage molecule than carbohydrates. Despite this, explain why, unlike animal cells, plant cells tend to store carbohydrates.
Main points | |
Key idea: | Varied functions of lipids in animals |
Triglycerides ·Energy store ·Buoyancy (for aquatic animals e.g. whales) ·Thermal insulation (for animals living in cold climate) ·Source of metabolic water (for animals living in the desert) ·Protects internal organs | |
Key idea: | Advantage of lipids over carbohydrates in terms of energy storage capacity |
·Lipid stores more energy per unit mass compared to carbohydrate ·Hence, greater mobility for animals | |
Key idea: | Possible reason why plants can afford to store their energy as carbohydrates |
·Plants are not mobile | |
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) (iv) Lipids store more energy per unit mass than carbohydrates because it has a higher proportion of H to O atoms per unit mass. Hence, they are easily oxidized and produce more ATP compared to an equivalent mass of carbohydrate (eg. glycogen) | |
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