List of top Microbiology Questions on Electron transport asked in GATE XL

Which of the following is/are active transport mechanism(s) in prokaryotes where the substance is chemically altered during transport across the membrane?
Which one or more of the following statements is/are correct regarding the electromotive force generated by electron transfer chain?
Which one or more of the following statements is/are correct regarding the electromotive force generated by electron transfer chain?