Concept explainers
Figure 17.7 You are working in a molecular biology lab and, unbeknownst to you, your lab partner left the foreign genomic DNA that you are planning to clone on the lab bench overnight instead of storing it in the freezer. As a result, it was degraded by nucleases, but still used in the experiment. The plasmid, on the other hand, is fine. What results would you expect from your molecular cloning experiment?
- There will be no colonies on the bacterial plate.
Introduction:
Molecular cloning is a process to reproduce desired fragments of the genome. In cloning the plasmid molecules can be used to provide a folder in which desired genomic fragment is inserted. Then plasmids are introduced into a bacterial host. Plasmids with foreign DNA into them are called recombinant DNA molecules.
Answer to Problem 1VCQ
Correct answer:
The correct answer is option (b)- there will be blue colony only.
Explanation of Solution
Explanation for the correct answer:
Option (b) is given as ‘there will be blue colony only’. In this experiment, when the cloning vector plasmid with degraded foreign DNA is transformed into a bacterial host strain, releases a dye which turns the colony blue. Therefore, option (b) is correct.
Explanation for incorrect answers:
Option (a) is given as ‘there will be no colonies on the bacterial plate’. The colonies will be present on the plate. So, it is a wrong answer.
Option (c) is given as ‘there will be blue and white colonies no colonies’. Both blue and white colonies are only possible when plasmids are with foreign DNA insert and without insert.
So, it is a wrong answer.
Option (d) given as ‘there will be white colony only’. White colonies are not possible as plasmids with insert are not capable to express their characters. So, it is a wrong answer.
Hence, options (a ), (c), and (d) are incorrect.
The molecular cloning is a process to reproduce the desired fragments of the genome is reproduced by molecular cloning with the help of plasmid which provides a folder in which desired genomic fragment is inserted. Hence, the correct answer is option (b).
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