In the famous experiment by Louis Pasteur, the straight and long-necked flasks served :
1. as the experimental setup
2. as a control
3. as a cohort
4. no useful purpose

Adenine was synthesized by Orgel, using the Miller apparatus, when he used the gas :
1. carbon dioxide
2. hydrogen cyanide
3. hydrogen sulfide
4. nitrogen

Which one of the following amino acids was not found to be synthesized in Miller’s experiment?  
1. Glycine.
2. Aspartic acid
3. Glutamic acid
4. Alanine