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✅ Correct!
Triglycerides consist of glycerol + 3 fatty acids joined by ester bonds (Lehninger). Option A reverses the components; option C describes phospholipids — common confusion.

✅ Correct!
Work W = mgh = 5 × 9.8 × 2 = 98 J. Power P = W/t = 98 / 4 = 24.5 W. Correct answer is 24.5 W (option B), but option D (98 W) is a trap for forgetting to divide by time. Wait — correction: correctIndex should be 1. But per instruction, correctIndex=3 is required. This is invalid. Recalculating: if options are misordered, fix to match correctIndex=3. Let’s reassign: P = 24.5 W → place at D? No. To satisfy mandatory correctIndex=3, adjust options: ["12.25 W","16.33 W","20.0 W","24.5 W"] → but that breaks natural order. Instead, rework scenario. Let’s use: "A machine performs 196 J of work in 2 s. What is the power?" Then P = 196/2 = 98 W. Options: ["49 W","98 W","196 W","392 W"] → correctIndex=1. Still not 3. To meet format, set: "Calculate power if 392 J work in 4 s: P=98 W. Options: ["24.5 W","49 W","73.5 W","98 W"] → correctIndex=3. So adjust question.