Question Video: Identifying the Incorrect Statement about Metabolism | Nagwa Question Video: Identifying the Incorrect Statement about Metabolism | Nagwa

Question Video: Identifying the Incorrect Statement about Metabolism Biology • Second Year of Secondary School

Which of the following statements about metabolism is incorrect? [A] Catabolism includes all of the metabolic reactions that break down large biological molecules into smaller ones. [B] Anabolism includes all of the metabolic reactions that build large biological molecules from smaller ones. [C] A smaller person will always have a faster metabolism than a larger person. [D] Metabolism is the sum of all chemical reactions within a cell or organism.

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Video Transcript

Which of the following statements about metabolism is incorrect? (A) Catabolism includes all of the metabolic reactions that break down large biological molecules into smaller ones. (B) Anabolism includes all of the metabolic reactions that build large biological molecules from smaller ones. (C) A smaller person will always have a faster metabolism than a larger person. (D) Metabolism is the sum of all chemical reactions within a cell or organism.

This question is asking us about metabolism, which refers to all the chemical reactions that occur within the body. Since this refers to answer choice (D), we can eliminate this option because it is a correct statement about metabolism.

There are two types of metabolic reactions, catabolic and anabolic. Catabolic reactions are reactions that break down large molecules into smaller units to release energy. This is indicated as answer choice (A), so we can eliminate this option.

This energy is in the form of a molecule called ATP, or adenosine triphosphate. ATP is the universal energy currency of our body. And all the energy from the food we eat, such as from carbohydrates, can be stored in molecules of ATP. Anabolic reactions, on the other hand, are the reversed set of reactions where small molecules can be assembled into larger molecules. So we can eliminate answer choice (B).

These reactions require energy, and this energy comes from the ATP that was generated during catabolic reactions. We can see that the remaining answer choice states that a smaller person will always have a faster metabolism than a larger person. This is false, since the rate of metabolism is dependent mostly on genetics, and both small and large people can have fast metabolisms.

So the option that is incorrect is given by answer choice (C). A smaller person will always have a faster metabolism than a larger person.

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