<Ul> <Li> Yeast integrative plasmid (YIp), yeast vectors that rely on integration into the host chromosome for survival and replication, and are usually used when studying the functionality of a solo gene or when the gene is toxic . Also connected with the gene URA3, that codes an enzyme related to the biosynthesis of pyrimidine nucleotides (T, C); </Li> <Li> Yeast Replicative Plasmid (YRp), which transport a sequence of chromosomal DNA that includes an origin of replication . These plasmids are less stable, as they can get lost during the budding . </Li> </Ul> <Li> Yeast integrative plasmid (YIp), yeast vectors that rely on integration into the host chromosome for survival and replication, and are usually used when studying the functionality of a solo gene or when the gene is toxic . Also connected with the gene URA3, that codes an enzyme related to the biosynthesis of pyrimidine nucleotides (T, C); </Li> <Li> Yeast Replicative Plasmid (YRp), which transport a sequence of chromosomal DNA that includes an origin of replication . These plasmids are less stable, as they can get lost during the budding . </Li> <P> As alluded to above, plasmids are often used to purify a specific sequence, since they can easily be purified away from the rest of the genome . For their use as vectors, and for molecular cloning, plasmids often need to be isolated . </P>

Which of the following are features of plasmids