Capacity of λ Charon 34 and Charon 35 vectors Up to what insert size can the lambda vectors Charon 34 and Charon 35 reliably clone DNA?

Introduction / Context:
Charon series vectors are engineered λ phage replacement vectors used historically for genomic libraries. Knowing typical insert capacities is key for choosing appropriate vectors in classical cloning workflows.

Given Data / Assumptions:

• λ replacement vectors accept larger inserts than insertion vectors.
• Packaging constraints limit total genome length within defined bounds.
• Charon 34/35 are examples used in many early library constructions.

Concept / Approach:
For λ replacement vectors like Charon 34 and 35, stuffer removal allows inserts roughly in the 9–20 kb range while maintaining efficient packaging. Inserts smaller than ~9 kb or larger than ~20 kb risk poor packaging and plaque formation failure.

Step-by-Step Solution:

Verification / Alternative check:
Historical protocols and manuals report successful cloning within ~10–20 kb for these vectors, aligning with the chosen range.

Why Other Options Are Wrong:

• 1–2 kb or 6–7 kb are too small (insertion vector territory).
• 30–35 kb and above exceed λ packaging tolerance.

Common Pitfalls:
Ignoring both minimum and maximum packaging thresholds leads to failed library construction.

Final Answer:
9–20 kb