The Question is from neet-botany cell-biology , and it was created by the author B VENKAT

Question

Polyhydroxybutyrate (PHB) granules in prokaryotes serve primarily as a reserve of:

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Prokaryotic storage granules
 **Related Topics**: Metabolism, carbon storage, energy storage, prokaryotic cell biology
 **Prerequisites**: Understanding of basic prokaryotic cell structure and function.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the primary function of PHB granules in prokaryotes.
  PHB stands for Polyhydroxybutyrate.
**Method & Steps**:
 1. Identify the nature of PHB.
  Reasoning: PHB is a polymer of hydroxybutyrate monomers.  Hydroxybutyrate is a derivative of butyric acid, which is a fatty acid. Fatty acids are a major source of energy and carbon in cells.
  Formula/Rule: None directly applicable, but understanding the chemical nature of PHB is key.
 2. Consider the role of storage granules in prokaryotes.
  Working: Prokaryotes, lacking internal membrane-bound organelles, store excess nutrients and energy in the cytoplasm as inclusion bodies or granules. These granules act as reservoirs for later use when nutrients are scarce.
  Key Point: The type of granule determines what is stored (e.g., glycogen for carbohydrates, PHB for carbon and energy).
 3. Determine the primary function of PHB granules.
  Result: PHB granules serve as a reserve of carbon and energy for the prokaryotic cell.  When energy or carbon sources are limited, the cell can break down the PHB to obtain both.
  Verification: The chemical structure of PHB supports its role in energy and carbon storage.  Numerous studies confirm this function.
 ## OPTION ANALYSIS
A :x: Nitrogen is stored in other granules, not primarily PHB.
B :x: Phosphorus is stored in polyphosphate granules, not PHB.
C ✓: PHB is a carbon-rich polymer and is metabolized to yield energy.
D :x: Sulfur is stored in elemental sulfur granules, not PHB.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing PHB with other storage granules: Remembering the specific storage molecules for each nutrient is important.
  2.Focusing only on energy storage:  Recognizing that PHB also provides a carbon source is crucial.
 **Quick Tips**:
  1.Remember PHB as a polymer of fatty acid derivatives – linking it to energy and carbon.
  2.Associate PHB with prokaryotic storage granules and their general function.

B VENKAT · Answer

Nitrogen

B VENKAT · Answer

Phosphorus

B VENKAT · Answer

The correct Option is "Carbon and energy"

B VENKAT · Answer

Sulfur

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