OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An extra-chromosomal double stranded circular DNA molecule
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An extra-chromosomal double stranded linear DNA molecule
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An extra-chromosomal single stranded DNA molecule
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An extra-chromosomal triple stranded DNA molecule
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Detailed explanation-1: -Plasmids are extra chromosomal genetic element found in many bacteria. Plasmids are closed circles of double stranded DNA that can exists and replicate independently of the chromosome. Plasmids provide genetic instruction for certain cell activities (e.g. resistance of antibiotic drugs).
Detailed explanation-2: -A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell’s chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance.
Detailed explanation-3: -Extrachromosomal circular DNA (eccDNA) is a double-stranded DNA molecule found in various organisms, including humans. In the past few decades, the research on eccDNA has mainly focused on cancers and their associated diseases.