G dating dna

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They often contain pigments used in photosynthesis, and the types of pigments in a plastid determine the cell's color.They have a common evolutionary origin and possess a double-stranded DNA molecule that is circular, like that of prokaryotic cells.

Depending on their morphology and function, plastids have the ability to differentiate, or redifferentiate, between these and other forms.Each plastid creates multiple copies of a circular 75–250 kilobase plastome.The number of genome copies per plastid is variable, ranging from more than 1000 in rapidly dividing cells, which, in general, contain few plastids, to 100 or fewer in mature cells, where plastid divisions have given rise to a large number of plastids.Plant nuclear genes encode the vast majority of plastid proteins, and the expression of plastid genes and nuclear genes is tightly co-regulated to coordinate proper development of plastids in relation to cell differentiation.Plastid DNA exists as large protein-DNA complexes associated with the inner envelope membrane and called 'plastid nucleoids'.

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