Where are the molecules of the ETC found in plant cells? Naim 01:11 AP Biology Chapter 10 Where are the molecules of the ETC found in plant cells? A. thylakoid membranes of chloroplasts B. stroma of chloroplasts c. inner membrane of mitochondria D. matrix of mitochondria E. cytoplasm Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+