7. If Nirenberg and Leder wanted to identify the amino acid, which is encoded by the codon UGC, how many experiments did they have to conduct with different labeled charged tRNA molecules

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.