For the phrase given below, indicate the type of metabolism referred to, using the following choices:
a. Anabolism only
b. Both anabolism and catabolism (amphibolic)
c. Catabolism only

Breaks a large molecule into smaller ones

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Understand the definitions of the metabolic types: Anabolism refers to the biosynthetic processes that build larger molecules from smaller ones, requiring energy input; Catabolism refers to the breakdown of larger molecules into smaller ones, releasing energy; Amphibolic pathways involve both anabolic and catabolic reactions.

Analyze the phrase 'Breaks a large molecule into smaller ones' to determine which metabolic process it describes. Since it involves breaking down molecules, it is associated with energy release.

Recognize that breaking down large molecules into smaller ones is a characteristic of catabolic metabolism, as it involves degradation and energy release.

Confirm that the phrase does not describe building molecules (anabolism) or a combination of both processes (amphibolic), but specifically the breakdown process.

Conclude that the correct type of metabolism referred to by the phrase is 'catabolism only'.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Catabolism

Catabolism is the metabolic process that breaks down large molecules into smaller units, releasing energy stored in chemical bonds. It includes reactions like digestion and cellular respiration, providing energy and building blocks for the cell.

Anabolism

Anabolism involves the synthesis of complex molecules from simpler ones, requiring energy input. It supports cell growth, repair, and storage by building macromolecules such as proteins, nucleic acids, and lipids.

Amphibolic Pathways

Amphibolic pathways function in both catabolism and anabolism, serving dual roles in breaking down molecules for energy and providing intermediates for biosynthesis. The citric acid cycle is a classic example of an amphibolic pathway.

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