Fundamentals Of Microbiology 10th Edition by Jeffrey Pommerville

Exercise 16

Answer the following questions that pertain to (1) transcription and translation, and (2) mutations. Use the genetic code (Table). A chemical is tested with the Ames test to see if the chemical is mutagenic and therefore possibly a tumor-causing chemical in humans. On the test plate containing the chemical, no his + colonies are seen near the central well. However, many colonies are growing some distance from the well. If these colonies truly represent his + colonies, why are there no colonies closer to the central well
Table: The Genetic Code Decoder