Abstract
Publisher Summary This chapter discusses some points of interest, concerning chloroplast deoxyribonucleic acid (DNA), and also with the remarkable phenomenon of the extranuclear DNA's found in chlorella cells that hugged the existence of “metabolic DNA” as well as the so-called “genetic DNA” in the cell. After the existence of DNA in chloroplasts had been established, mitochondrial DNA was also found and it is now a permissible working hypothesis that various cell organelles, with their own DNA, are autonomous bodies, within the cell, and behave as symbiotic living organisms. Their interactions, with each other, and their functional contributions to the whole cell are of marked interest to cell biochemistry and efforts to cultivate them in vitro, would appear to be the first step in this challenging task. Furthermore, the discovery of various kinds of minor DNA species, within the cell, has indicated the existence of “metabolic DNA” besides “genetic DNA.” This may possibly be significant in relation to the internal function of the cell bodies, and it is the author's belief that a new field in biology and nucleic acid biochemistry will develop from this problem.
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