BIOLOGY-W/ACCESS (LOOSELEAF) >CUSTOM<
BIOLOGY-W/ACCESS (LOOSELEAF) >CUSTOM<
10th Edition
ISBN: 9781305780330
Author: Solomon
Publisher: CENGAGE C
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Chapter 15, Problem 1TYU

A plasmid (a) can be used as a DNA vector (b) is a type of bacteriophage (c) is a type of cDNA (d) is a retrovirus (e) b and c

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Summary Introduction

Introduction: Plasmids are circular extra-chromosomal DNA molecules present in bacteria. They occur naturally and are self-replicate by themselves. Vector is a kind of plasmid that is manipulated by inserting a foreign DNA into it. This is known as recombinant DNA. It transfers DNA into the host organism. It replicates and expresses in the host organism.

Answer to Problem 1TYU

Correct answer: A plasmid can be used as a DNA vector. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “can be used as a DNA vector”. Plasmids are small extra-chromosomal DNA fragments that occur in bacteria. Bacterial plasmids are used as vectors by inserting a DNA segment of interest into them. These are known as vectors and they act as a vehicle to carry foreign DNA to the host cell. Vector sequence is digested; sequence is inserted; and then it is ligated together in a process known as transformation.

Hence, the correct answer is option (a).

Reasons for incorrect answers:

Option (b) is given as “is a type of bacteriophage”. Bacteriophages are viruses that infect bacteria. Hence, option (b) is incorrect.

Option (c) is given as “is a type of cDNA”. Plasmids are different from a cell’s chromosomal DNA and occur naturally. cDNA is synthesized from mRNA through reverse transcription. Hence, option (c) is incorrect.

Option (d) is given as “a retrovirus”. It is an RNA virus and transfers their genome into the host cell. Hence, option (d) is incorrect.

Option (e) is given as “b and c”. Options (b) and (c) are wrong answer choices. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

A plasmid is a small extra-chromosomal DNA segment that can be used as a DNA vector.

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Students have asked these similar questions
Why is DNA ligase so important in recombinant DNA technology? a.) It causes DNA to make multiple copies of itself. b.) It joins two DNA fragments together. c.) It shapes bacterial DNA into a circular plasmid. d.) It cuts DNA into restriction fragments.
Plasmids are important in biotechnology because they are Group of answer choices a. a vehicle for the insertion of foreign genes into bacteria b. recognition sites on recombinant DNA strands c. surfaces for protein synthesis in eukaryotic recombinants d. viruses incorporated into the host DNA
The polymerase chain reaction (PCR) is important because it allows us to Group of answer choices a. insert eukaryotic genes into prokaryotic plasmids b. incorporate genes into viruses c. make DNA from RNA transcripts d. make many copies of a target segment of DNA
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