From the list below, select the sequence of steps for...

From the list below, select the sequence of steps for cloning a piece of foreign DNA into a plasmid vector, introducing the plasmid into bacteria, and verifying that the plasmid and the insert are present: (1) Transform competent cells (2) Select for the lack of antibiotic resistance gene #1 function (3) Select for the plasmid antibiotic resistance gene #2 function (4) Digest vector and foreign DNA with EcoR1, which inactivates antibiotic resistance gene #1 (5) Ligate the digested DNA together with the foreign DNA $a.$ 45132 $b.$ 45123 $c.$ 13425 $d. $32145 $e.$ 13254

From the list below, select the sequence of steps for cloning a piece of foreign DNA into a plasmid vector, introducing the plasmid into bacteria, and verifying that the plasmid and the insert are present:
(1) Transform competent cells
(2) Select for the lack of antibiotic resistance gene #1 function
(3) Select for the plasmid antibiotic resistance gene #2 function
(4) Digest vector and foreign DNA with EcoR1, which inactivates antibiotic resistance gene #1
(5) Ligate the digested DNA together with the foreign DNA
$a.$ 45132
$b.$ 45123
$c.$ 13425
$d. $32145
$e.$ 13254

Key Concepts

Transformation

Transformation is the procedure by which bacteria take up foreign DNA, such as a recombinant plasmid. Making bacterial cells 'competent' enhances their ability to incorporate external DNA, which is a critical step for propagating and expressing the cloned DNA within a host.

Ligation

Ligation is the process of joining DNA fragments together using an enzyme called DNA ligase. In cloning, ligation seals the nicks in the sugar-phosphate backbone after the foreign DNA is inserted into the vector, resulting in a continuous, stable recombinant DNA molecule.

Selection Strategies

Selection strategies involve using markers, such as antibiotic resistance genes, to identify and isolate bacteria that have taken up the recombinant plasmid. These strategies may include positive selection, where only cells with the plasmid survive, and negative selection, where unwanted constructs are eliminated, ensuring that only the correct clones are analyzed.

Molecular Cloning

Molecular cloning is a technique that involves inserting a fragment of foreign DNA into a plasmid vector. This process typically includes preparing both the vector and the insert, assembling them, and then introducing the recombinant plasmid into a host organism to allow replication and further analysis.

Restriction Enzymes

Restriction enzymes are molecular scissors used to cut DNA at specific nucleotide sequences. They create specific ends on both the plasmid vector and the foreign DNA fragment, which is crucial for ensuring that the insert can be properly ligated into the vector in a controlled and predictable manner.