Question

Respiratory pathway is considered as a ________ pathway

• A. Catabolic
• B. Anabolic
• C. Amphibolic
• D. Fermentative

Hint:

A pathway is called amphibolic when it plays a dual role—breaking down molecules for energy and providing intermediates for biosynthesis.

Answer 1

The Correct Option is C

Step 1: Understanding types of metabolic pathways. 
Metabolic pathways can be categorized as:
Catabolic (breakdown of molecules to release energy),
Anabolic (synthesis of complex molecules), and
Amphibolic (functioning both as anabolic and catabolic).
Step 2: Nature of respiratory pathway. 
The respiratory pathway (like glycolysis, Krebs cycle) primarily breaks down glucose to release energy, making it catabolic. However, intermediates of the pathway are also used for biosynthetic (anabolic) processes such as synthesis of amino acids and nucleotides. 
Step 3: Conclusion. 
Since it serves both anabolic and catabolic functions, the respiratory pathway is termed amphibolic.