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Introduction: Vector is a key material that is used in the process of gene cloning. It acts as a carrier of the DNA segment that has to be cloned. When this vector is introduced into a living cell, it replicates with the DNA it carries and produces many identical copies of the inserted gene.
Answer to Problem 1TY
Correct answer: The vectors used to clone genes were derived originally from plasmids or viruses. Hence, the correct answer is option e.
Explanation of Solution
Reason for correct answer:
The vectors commonly used in the gene cloning experiments are derived from plasmids or viruses. The plasmids contain unique sites into which the gene of interest can be easily inserted. Viruses can also be used as vectors to carry the pieces of DNA. This is because when a gene of interest is inserted into a viral vector, the gene gets replicated along with the replication of the viral DNA.
Option e. is given as “b and c only”.
Plasmids are small, circular pieces of DNA that are naturally found in many strains of bacteria. The plasmids exist independently of the bacterial chromosome. The plasmids can be genetically engineered for the effective use in cloning experiments. The viral vectors infect living cells and propagate themselves by taking control of the host cell’s
Reasons for incorrect answer:
Option a. is given as, “proteins”.
The vectors are not derived from proteins. Hence, option a. is incorrect.
Option b. is given as, “plasmids”.
The vectors are derived not only from plasmids but also from the viruses. Hence, option b. is incomplete.
Option c. is given as, “viruses”.
The vectors are derived not only from viruses but also from plasmids. Hence, option c. is incomplete.
Option d. is given as, “all of the above”.
The vectors are derived from plasmid or viruses, but not from proteins. Hence, option d. is incorrect.
Hence, the options a., b., c., and d. are incorrect.
Hence, the vectors used to clone the genes are derived originally from viruses or plasmids.
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Chapter 20 Solutions
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