Microbiology Lecture Exam #2 Questions And Answers (Graded A)

Conjugation differs from reproduction because conjugation a) replicates DNA b) transfers DNA vertically, to new cells c) transfers DNA horizontally, to cells in the same generation d) transcribes DNA to RNA e) copies RNA to make DNA {Ans: c}Three cells with generation times of 60 minutes are inoculated into a culture medium. How many cells are there after 5 hours? a) 900 b) 180 c) 96 d) 32 e) 15 {Ans: c}What carries the coded information for making specific proteins from DNA to ribosomes? a) mRNA b) rRNA c) tRNA d) RNA polymerase {Ans: a}What is the purpose of transcription of DNA? {Ans: To take DNA and make a copy, mRNA, so that it can leave the nucleus and go to a ribosome.}You discovered a unicellular organism that lacks a nucleus and peptidoglycan. You suspect the organism is in the group: a) animalia b) archaea c) bacteria d) fungi e) plantae {Ans: b}Most bacteria grow best at which pH? a) 1 b) 5 c) 7 d) 9 e) 14 {Ans: c}