Multiple Choice
How does increasing temperature generally affect the concentration of dissolved oxygen in water?
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7. Energy and Metabolism
Introduction to Energy
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Why does food have potential energy?
A
Because food is always in motion, giving it kinetic energy.
B
Because the chemical bonds in food molecules store energy that can be released during cellular respiration.
C
Because food contains water, which is a source of energy.
D
Because food absorbs energy from sunlight directly.
Verified step by step guidance1
Understand the concept of potential energy: Potential energy is stored energy that has the capacity to do work when released. In the context of food, this energy is stored in the chemical bonds of molecules.
Learn about chemical bonds in food molecules: Food molecules, such as carbohydrates, fats, and proteins, contain chemical bonds that store energy. These bonds are formed during chemical reactions and can be broken during metabolic processes to release energy.
Explore cellular respiration: Cellular respiration is the process by which cells break down food molecules (like glucose) to release the stored energy. This energy is then used to produce ATP (adenosine triphosphate), the primary energy currency of the cell.
Clarify why food does not have kinetic energy: Kinetic energy is the energy of motion, and food itself is not in motion. The energy in food is stored in its chemical structure, making it potential energy rather than kinetic energy.
Eliminate incorrect options: Food does not absorb energy directly from sunlight (plants do this during photosynthesis), and water in food is not a direct source of energy. The correct explanation is that food has potential energy because the chemical bonds in food molecules store energy that can be released during cellular respiration.
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