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(v) Functions in transduction of energy., , Note:, , * The sum total of all plastids in a cell is, called plastidome., , * The chloroplast with nitrogen fixing genes, are called nitroplast., , * The space between the two membrane is, called intermembrane space, which separates, the two membrane. This space contains a, narrow fluid. Stroma also contains small,, double-stranded circular DNA, molecules and, ribosomes., , Ribosomes of chloroplasts are smaller (70S), than the ribosomes of cytoplasm, (80S).Ribosomes, , These are the small sub-spherical granular, organelles, not bounded by any membrane., Ribosomes were first observed by George, Palade (1953), as the dense particles under, the electron microscope. Hence, are also, called Palade particles.