[Answer] 20) Which two cellular organelles in eukaryotes have both electron transport systems and chemiosmotic mechanisms?a. Ribosomes and endoplasmic reticulumb. Chloroplasts and endoplasmic reticulumc. Chloroplasts and mitochondriad. Mitochondria and nucleie. Nuclei and Golgi apparatus Practice questions 2 for exam 1 (ch 8-10)