Advertisements
Advertisements
Questions
What does ‘competent’ refer to in competent cells used in transformation experiments?
What does ‘competent’ refer to in competent cells used in transformation?
Advertisements
Solution
Competent means bacterial cells, on treatment with CaCl₂, are made capable of taking up foreign DNA.
APPEARS IN
RELATED QUESTIONS
Name the selectable markers in the cloning vector pBR322. Mention the role they play.
Draw a schematic sketch of pBR 322 plasmid and label the following in it:
(a) Any two restriction sites.
(b) Ori and rop genes.
(c) An antibiotic resistant gene.
What is ‘Ori’ ? State its importance during cloning of a vector.
Answer the following question.
β galactosidase enzyme is considered a better selectable marker. Justify the statement.
How does the β-galactosidase coding sequence act as a selectable marker? Why is it a preferred selectable marker to antibiotic resistance genes? Explain.
The genetic material of virus includes:
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of ______.
Which of the following is correctly matched?
Which of the following statement is not true for a clone?
A suitable vector for gene cloning in higher organism is ______.
Plasmids are suitable vectors for gene cloning because these ______.
Plasmid pBR322 has a PstI restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain.
Describe the role of CaCl2 in the preparation of competent cells?
Name the regions marked A, B and C.
For selection of recombinants, insertional inactivation of antibiotic marker has been superceded by insertional inactivation of a marker gene coding for a chromogenic substrate. Give reasons.
Which of the following enzyme(s) are NOT essential for gene cloning?
- Restriction enzymes
- DNA ligase
- DNA mutase
- DNA recombinase
- DNA polymerase
Choose the correct answer from the options given below:
The following diagram showing restriction sites in E. coli cloning vector pBR322. Find the role of ‘X’ and ‘Y’ genes:
