1. Plasmids are circular pieces of double-stranded DNA. However, in class, we will be working with a linearized plasmid. Choose the best possible answer that makes both previous statements possible. a) Plasmids can naturally exist as both linear and circular, the scientist has to choose the plasmid that best fits their needs b) Plasmids are naturally occurring circular double-stranded DNA molecules but can become linear via spontaneous reactions c) Plasmids are naturally occurring circular double-stranded DNA molecules but can be made linear with the use of exonucleases d) Plasmids are naturally occurring circular double-stranded DNA molecules but can be made linear with the use of endonucleases e) Plasmids are naturally occurring circular double-stranded DNA molecules; they cannot exist a linear DNA or they would get quickly degraded..