6 public questions tagged with this topic.
Plasmids are small, circular DNA molecules that can be exchanged between bacteria, enabling genetic recombination. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Transformation does not require a virus; it can occur naturally or be induced using chemical or physical treatments.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Competent Host and Gene Transfer Methods
Transformation does not require a virus. It can be induced artificially using calcium chloride treatment or electroporation.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Competent Host and Gene Transfer Methods
Transformation is the process where bacteria take up foreign DNA from their surroundings and integrate it into their genome.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Competent Host and Gene Transfer Methods
Crossing over occurs during meiosis and allows genetic recombination between homologous chromosomes.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Search for Genetic Material and RNA World
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, unlike phage-mediated transfer which remains DNase resistant and protected.
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 6: Bacterial Transformation Mechanism
