Understanding Metabolism: Anabolism and Catabolism

Metabolism refers to all the chemical reactions occurring within a living organism to maintain life. These reactions are broadly classified into two types:

• Catabolism: The breakdown of complex molecules into simpler ones, typically releasing energy.
• Anabolism: The synthesis of complex molecules from simpler ones, requiring energy input.

Identifying Anabolic Processes

The question asks to identify the processes that build up molecules or tissues, which are characteristic of anabolism.

Analysis of Options:

• Growth (Option A): Growth involves the synthesis of new cellular material and increase in size. This construction process requires energy and is an anabolic activity.
• Storage (Option B): Storing energy, such as forming glycogen from glucose or fats from fatty acids and glycerol, is a building process. Synthesis requires energy, making it anabolic.
• Respiration (Option C): Cellular respiration breaks down molecules like glucose to release energy. This is a catabolic process.
• Excretion (Option D): This is the process of removing metabolic waste products. It is a functional process of elimination, not directly related to building or breaking down molecules for energy or synthesis.

Conclusion

Both Growth and Storage involve the synthesis of larger molecules from smaller precursors, requiring energy input. These are fundamental anabolic processes within metabolism.