Describe the characteristics of the mixed prokaryote and eukaryote slide that allowed you to identify the prokaryotes and the eukaryotes. Reference photo 7 in your answer. a. The presence of a nucleus and membrane-bound organelles in eukaryotes. b. The absence of a nucleus and membrane-bound organelles in prokaryotes. c. Distinct cell shapes and sizes between prokaryotes and eukaryotes visible in photo 7. d. Both a and b.