Multiple choice In 1942, who demonstrated that an E. coli T2 phage has a head and a tail? Salvador Luria and Max Delbruck Thomas Anderson and Salvador Luria Salvador Luria and Alfred Day Hershey Andre Lwoff and Louis Siminovitch Reveal answer Fill a bubble to check yourself B Correct answer Explanation In 1942, Thomas Anderson and Salvador Luria demonstrated that an E. coli T2 phage has a head and a tail. They photographed bacteriophages with the aid of an electron microscope.