Answer:
C analysis Nostoc flagelliforme belongs to prokaryote, and A is wrong; Nostoc flagelliforme belongs to prokaryote and contains no chloroplast, B error; Nostoc flagelliforme and lettuce can carry out photosynthesis, so they are autotrophs, and C is correct; Nostoc flagelliforme belongs to prokaryote, without nuclear membrane, D error. The similarities and differences in morphology and structure between prokaryotic cells and eukaryotic cells are located in the experimental site. Nostoc flagelliforme belongs to prokaryote and lettuce belongs to eukaryote. Compared with eukaryotic cells, prokaryotic cells have no formed nucleus (no nuclear membrane, nucleoli and chromosomes). Prokaryotes only have ribosomes as organelles, but prokaryotes contain cell membranes, cytoplasmic structures, nucleic acids and protein. ?