41. Xanthophyte chloroplasts contain the ?-carotene, and the carotenoid diadinoxanthin. 42. It was based on molecular phylogenetic analysis of chloroplast and species complex. 43. The lack of a skeleton allows more light to reach the chloroplasts . 44. Rather, they bear a striking resemblance to chloroplasts themselves. 45. This suggests that organisms resembling cyanobacteria were the evolutionary precursors of chloroplasts . 46. Chloroplast transit peptides exhibit huge variation in length and amino acid sequence.47. Bacteria to archaea and eukaryotes via endosymbiotic ancestors of mitochondria and chloroplasts . 48. DNA in chloroplasts codes for redox proteins such as photosynthetic reaction centers. 49. Carotenoids soak up those free radicals to protect the all-important chloroplasts . 50. In plants, chlorophyll is found only in chloroplasts .
