Gene Cloning and Vector Functions

The video tutorial explains the process of using vectors, specifically the pBR322 plasmid vector, to express a gene that can cure cancer. It covers the necessity of vectors in gene expression, the components of the pBR322 vector, and how replication is controlled within host cells. The tutorial also discusses the use of restriction enzymes for gene insertion and the role of selectable markers in identifying successful gene incorporation.

Why are host cells used in large-scale protein production?

• They are resistant to all types of diseases.

• They are easy to manipulate genetically.

• They naturally produce large amounts of protein.

• They act as factories for gene expression.

What is the primary role of a vector in gene cloning?

• To directly cure diseases.

• To destroy unwanted genes.

• To replicate independently of the host cell.

• To carry and help express the gene of interest.

What does the 'p' in pBR322 stand for?

• Promoter

• Plasmid

• Protein

• Polymerase

What is the function of the origin of replication (ori) in a plasmid?

• To bind restriction enzymes.

• To start replication of the plasmid.

• To provide antibiotic resistance.

• To initiate transcription.

How does the rop gene affect plasmid replication?

• It increases the rate of replication.

• It initiates the transcription of the gene of interest.

• It stops replication entirely.

• It regulates the number of plasmid copies.

What is the role of restriction enzymes in gene cloning?

• To provide antibiotic resistance.

• To bind to the ori site.

• To cut DNA at specific sequences.

• To replicate the plasmid.

Why is it important to have a limited number of restriction sites for a single enzyme in a plasmid?

• To increase the number of plasmid copies.

• To avoid breaking the plasmid into multiple fragments.

• To ensure the plasmid does not degrade.

• To prevent the plasmid from being too large.

What is the purpose of selectable markers in a vector?

• To increase the plasmid's replication rate.

• To identify cells with the recombinant DNA.

• To initiate transcription.

• To bind restriction enzymes.

Which antibiotic resistance gene is NOT mentioned as a selectable marker in pBR322?

• Kanamycin

• Tetracycline

• Chloramphenicol

• Ampicillin

What is the final step after preparing the vector with all necessary components?

• Destroying the host cells.

• Adding more restriction sites.

• Cloning the vector inside a host cell.

• Removing the ori site.