21. Euglenophyte chloroplasts have a pyrenoid and thylakoids stacked in groups of three. 22. Cryptophyte chloroplasts contain a nucleomorph that superficially resembles that of the chlorarachniophytes. 23. Inside cryptophyte chloroplasts is a pyrenoid and thylakoids in stacks of two. 24. Fucoxanthin is also found in haptophyte chloroplasts , providing evidence of ancestry. 25. As in prokaryotes, genes in chloroplast DNA are organized into operons. 26. There are some common misconceptions about the outer and inner chloroplast membranes. 27. One square millimeter of leaf tissue can contain half a million chloroplasts . 28. Manganese is also important in photosynthetic oxygen evolution in chloroplasts in plants. 29. In plants and algae, photosynthesis takes place in organelles called chloroplasts . 30. A typical plant cell contains about 10 to 100 chloroplasts .
