3. Which of the following structures can be found in a prokaryote? a. Mitochondria b. Rough endoplasmic reticulum c. Nuclear envelopes d. Pili e. Amyloplasts 4. Which of the following structures can be found both in eukaryotes and prokaryotes? a. Ribosomes b. Nuclei c. Nucleoli d. Thylakoids e. Pili.