AP BIOLOGY

Detailed explanation-1: -ATP is like a charged battery, while ADP is like a dead battery. ATP can be hydrolyzed to ADP and Pi by the addition of water, releasing energy.

Detailed explanation-2: -ADP is like a rechargeable battery that powers the machinery of the cell. Similar to a battery being charged, ADP becomes “fully charged” when it is converted to the higher-energy molecule ATP. The energy from ATP powers many cell processes.

Detailed explanation-3: -An analogy between ATP and rechargeable batteries is appropriate. The batteries are used, giving up their potential energy until it has all been converted into kinetic energy and heat/unusable energy. Recharged batteries (into which energy has been put) can be used only after the input of additional energy.

Detailed explanation-4: -ADP and ATP are like batteries because they store energy in the chemical bonds they contain. ADP has only two phosphate groups (and fewer bonds), so it’s like a par-tially charged battery. ATP has three phos-phate groups, so it is like a fully charged battery and has more bonds available for energy storage.