9 public questions tagged with this topic.
Selectable markers, such as antibiotic resistance genes, help identify transformed cells by allowing only recombinant cells to survive.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Bioreactors and Downstream Processing
Selectable markers, such as antibiotic resistance genes, allow researchers to identify and isolate transformed cells.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Bioreactors and Downstream Processing
Selectable markers, such as antibiotic resistance genes, help in identifying recombinant cells.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Cloning Vectors - Plasmids Phages Cosmids Selectable Markers Ori
Selectable markers do not inhibit bacterial growth but rather help distinguish transformed from non-transformed cells.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Cloning Vectors - Plasmids Phages Cosmids Selectable Markers Ori
Selectable markers, such as antibiotic resistance genes, help distinguish transformed cells from non-transformed cells.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Principles of Biotechnology - Genetic Engineering
Mycoplasmas are among the smallest cells, approximately 0.3 µm long, and lack a cell wall. Plasmids are small circular DNA molecules outside the bacterial genomic DNA. They can confer properties such as antibiotic resistance and help monitor transformation with foreign DNA.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Prokaryotic Cell - Structure and Components
Natural selection reflects key principle in quiz on theory of evolution, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Natural selection aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Natural selection fits helps integrate natural selection, environment.
Ref: Campbell Biology, 12th ed., Chapter 22: Descent with Modification.
R plasmids, resistance plasmids, carry gene cassettes encoding enzymes that degrade or modify antibiotics, efflux pumps, or target alteration proteins. Common determinants include bla for ampicillin beta-lactamase, tet for tetracycline efflux, cat for chloramphenicol acetyltransferase, and aad for streptomycin adenylyltransferase. They accumulate through transposon insertion and integron capture, producing multidrug-resistant isolates. Spread via conjugation in hospitals accelerates nosocomial infection resistance. Incompatibility grouping classifies R plasmids, and their control relies on understanding replicon dominance and horizontal transfer dynamics in clinical settings.
Ref: Hartl & Jones, Genetics, 8th ed., Chapter 6: Antibiotic Resistance Plasmids; Nature, R Factors
Markers distinguishing recombinant from non-recombinant clones can be scorable reporters whose phenotype alters upon insertional inactivation. Green fluorescent protein provides intrinsic fluorescence detectable under UV without exogenous substrate, making it convenient for colony screening. Vectors containing GFP transcriptional fusion show fluorescence when empty; cloning into gfp disrupts chromophore formation, extinguishing signal in recombinants. Origin of replication governs replication, while AmpR and TetR are selectable markers conferring survival on antibiotics but not visual distinction between recombinant and empty plasmid states. Thus GFP offers rapid optical differentiation.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
