Which of the following investigators was (were) responsible for determining that DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine? Which of the following investigators was (were) responsible for determining that DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine? Matthew Meselson and Franklin Stahl Alfred Hershey and Martha Chase Oswald Avery, Maclyn McCarty, and Colin MacLeod Erwin Chargaff