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Transformation refers to the process by which bacterial cells take up foreign DNA from their surroundings.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Bioreactors and Downstream Processing
Transformation is the process of introducing foreign DNA into bacterial cells, either naturally or artificially.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Bioreactors and Downstream Processing
Calcium chloride increases the permeability of bacterial cell membranes, making them competent for DNA uptake.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Competent Host and Gene Transfer Methods
Transformation is a method used to introduce foreign DNA into bacterial cells, either naturally or through artificial methods like electroporation.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Principles of Biotechnology - Genetic Engineering
Transformation involves competent bacteria binding extracellular naked DNA released from lysed cells and importing single strand through competence pseudopilus and Com proteins. No protein coat or phage capsid surrounds DNA; it is deproteinized, often as linear fragments, protected only by its own chemical stability. Once inside, homologous sequences integrate via RecA-mediated recombination replacing recipient allele. Competence develops in Bacillus subtilis, Streptococcus pneumoniae, Haemophilus. Naked nature is proven by DNase sensitivity: addition of DNase destroys transforming activity, u
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 6: Bacterial Transformation Mechanism
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