Question

all organisms need food for energy. but how does an organisms body actually get energy out of food?
food supplies an organism with many small, energy - rich molecules. these molecules are taken in by the organisms cells. inside cells, the molecules from food are broken down to release energy that cells can use. this energy powers cell processes that allow the entire organism to grow and live.
select all the true statements.
food molecules remain unchanged during cellular respiration.
cells use energy to help an organism grow and live.
cells can get energy by breaking down molecules from food.
cells usually take in large food molecules.

Explanation:

• Food molecules remain unchanged during cellular respiration: This is false. During cellular respiration, food molecules like glucose are broken down (e.g., in the reaction \(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+\text{energy}\)).

• Cells use energy to help an organism grow and live: This is true. The energy released from food molecules (e.g., in the form of ATP) is used for cell - based processes such as biosynthesis (for growth) and maintaining homeostasis (for living).
• Cells can get energy by breaking down molecules from food: This is true. As described in the text, inside cells, molecules from food are broken down to release energy. For example, through glycolysis, the Krebs cycle, and oxidative phosphorylation in cellular respiration.
• Cells usually take in large food molecules: This is false. Cells take in small, energy - rich molecules. Large food molecules (like starch, proteins) are first digested (broken down) into smaller units (glucose, amino acids) before being taken up by cells.

Answer:

• "Cells use energy to help an organism grow and live."
• "Cells can get energy by breaking down molecules from food."