Publisher Summary This chapter highlights endosymbiont hypothesis. All contemporary
genomes (including those of plastids and mitochondria) ultimately derive from a single …

There are four major classes of introns: self-splicing group I and group II introns, tRNA
and/or archaeal introns and spliceosomal introns in nuclear pre-mRNA. Group I introns are …

Dispersed repetitive DNA sequences have been described recently in eubacteria. To assess
the distribution and evolutionary conservation of two distinct prokaryotic repetitive elements …

Figure 1. The gene map of the chromosome and the plasmids of Anabaena sp. PCC 7120.
The circular chromosome (6,413,771 bp) and the six plasmids, pCC7120α (408,101 bp) …

Synechococcus elongatus PCC 7942 is a model organism used for studying photosynthesis
and the circadian clock, and it is being developed for the production of fuel, industrial …

eubacteria, it is possible that group II self-splicing introns existed for about 1750 million
years before they (or a similar self-splicing type) eventually evolved into spliceosomal …

Group I introns, which are widespread in nature, carry out RNA self–splicing. The secondary
structure common to these introns was for the most part established a decade ago …

Introns and spacers are a rich and well-appreciated information source for evolutionary
studies in plants. Compared to coding sequences, the mutational dynamics of introns and …

LIKE nuclear premessenger introns, group II self-splicing introns are excised from primary
transcripts as branched molecules, containing a 2′–5′ phosphodiester bond. For this …

▪ Abstract The entire sequence (120∼ 190 kb) of chloroplast genomes has been determined
from a dozen plant species. The genome contains from 87 to 183 known genes, of which …