Question:
Which of the following is true for 35S promoter
Which of the following is true for 35S promoter
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To express a gene under specific environmental conditions, scientists replace the CaMV 35S promoter with inducible promoters like *rd29A* (stress-inducible) or *Hsp70* (heat-inducible).
Updated On: Jul 13, 2026
- Constitutive promoter
- Seed-specific promoter
- Salt-stress specific promoter
- Heat-specific promoter
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Promoters are DNA sequences that direct RNA polymerase to initiate transcription.
They can be constitutive (always active), tissue-specific (active only in certain organs), or inducible (responsive to environmental cues).
Step 2: Detailed Explanation:
- The CaMV 35S promoter is isolated from the Cauliflower Mosaic Virus.
- It is a highly powerful and robust constitutive promoter in plants.
- It directs high levels of gene expression across almost all tissue types and developmental stages of transgenic plants.
- Because of its strength and lack of tissue specificity, it is widely used in plant genetic engineering to drive marker and selection genes.
Step 3: Final Answer:
The 35S promoter is a constitutive promoter.
Promoters are DNA sequences that direct RNA polymerase to initiate transcription.
They can be constitutive (always active), tissue-specific (active only in certain organs), or inducible (responsive to environmental cues).
Step 2: Detailed Explanation:
- The CaMV 35S promoter is isolated from the Cauliflower Mosaic Virus.
- It is a highly powerful and robust constitutive promoter in plants.
- It directs high levels of gene expression across almost all tissue types and developmental stages of transgenic plants.
- Because of its strength and lack of tissue specificity, it is widely used in plant genetic engineering to drive marker and selection genes.
Step 3: Final Answer:
The 35S promoter is a constitutive promoter.
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