The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author NISHANTH

Question

During photorespiration RUBISCO acts as

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
**Primary Concept**: Photorespiration and the dual activity of RUBISCO.
**Related Topics**: Photosynthesis, enzyme specificity.
**Prerequisites**: Basic understanding of photosynthesis and photorespiration.
## SOLUTION PATHWAY
**Given Information**:
    RUBISCO is an enzyme that can act as both a carboxylase and an oxygenase.
    The question is specifically about its role in photorespiration.
**Method & Steps**:
   1. Recall the process of photorespiration:
     Reasoning: Photorespiration is a process where RUBISCO binds to oxygen instead of carbon dioxide.
     Formula/Rule: None
   2. Identify the activity of RUBISCO during photorespiration:
     Working: When RUBISCO binds to oxygen, it acts as an oxygenase.
     Key Point: This is a specific characteristic of photorespiration.
   3. Select the correct option:
     Result: The correct answer is Oxygenase.
     Verification: This is a known fact in the context of photorespiration.
## OPTION ANALYSIS
[A] ✓:  Correct, during photorespiration RUBISCO acts as an oxygenase by binding to oxygen.
[B] :x: Incorrect, RUBISCO acts as a carboxylase during the carbon fixation phase of photosynthesis, not photorespiration.
[C] :x: Incorrect, a transaminase is an enzyme involved in amino acid metabolism, not related to RUBISCO.
[D] :x: Incorrect, a reductase is an enzyme involved in reduction reactions, not the primary role of RUBISCO.
## LEARNING AIDS
**Common Mistakes**:
    1. Confusing RUBISCO's roles: Remembering that RUBISCO has two activities (oxygenase and carboxylase) and the context in which each occurs is essential.
    2. Misunderstanding the process of photorespiration: Not knowing that oxygen binding to RUBISCO initiates photorespiration.
**Quick Tips**:
    1. Remember that 'photorespiration' involves oxygen and therefore RUBISCO acts as an 'oxygenase'.
    2. Associate 'carboxylation' with the 'carbon fixation' phase of photosynthesis.

NISHANTH · Answer

The correct Option is "Oxygenase"

NISHANTH · Answer

Carboxylase

NISHANTH · Answer

Transaminase

NISHANTH · Answer

Reductase

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