MEGA
Energy in Biology
Cellular respiration is a chemical process in which the bonds between atoms of food molecules and oxygen molecul…
Item EB034001: The reactants ATP + water have more energy than the products ADP + Pi because this reaction transfers energy to the surroundings.
A chemical reaction that converts ATP to ADP and inorganic phosphate occurs in plants and animals. How does the energy of the system of reactants of this reaction compare to the energy of the system of products?
- The reactants have more energy than the products because energy is always given off during chemical reactions.
- The reactants have more energy than the products because this reaction transfers energy to the surroundings.
- The reactants have less energy than the products because all chemical reactions take in energy from the surroundings.
- The reactants have less energy than the products because energy is created by the plants and animals during this reaction.
- Distribution of Responses
- Points Earned
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 49 | 168 | 29% |
| Grades | |||
| 6–8 | N/A | N/A | N/A |
| 9–12 | 40 | 145 | 28% |
| Gender | |||
| Male | 25 | 92 | 27% |
| Female | 16 | 55 | 29% |
| Primary Language | |||
| English | 40 | 141 | 28% |
| Other | 4 | 11 | 36% |
- Distribution of Responses
- Points Earned
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 65 | 170 | 38% |
| Grades | |||
| 6–8 | N/A | N/A | N/A |
| 9–12 | 56 | 150 | 37% |
| Gender | |||
| Male | 27 | 85 | 32% |
| Female | 29 | 65 | 45% |
| Primary Language | |||
| English | 52 | 143 | 36% |
| Other | 3 | 6 | 50% |
- Notes
- College Board, S.4.2: Energy Transfer, grades 9-12: • The transfer of chemical energy within living systems involves chemical reactions among ATP, ADP and an inorganic phosphate. The conversion of ATP to ADP and an inorganic phosphate drives other essential reactions in living systems. • During cellular respiration, molecules from food — mainly sugars and fats — are converted in the presence of oxygen into carbon dioxide and water, and the chemical energy of that reaction is used to combine ADP and an inorganic phosphate to make ATP.