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

What is the purpose of DNA replication? {Ans: To replicate DNA for cellular processes as well as cellular reproduction.}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.}A culture medium on which only gram-positive organisms grow and a yellow halo surrounds Staphylococcus aureus colonies is called a(n) a) selective medium b) differential medium c) enrichment culture d) selective and differential medium e) differential and enrichment culture {Ans: d}A codon is a) a segment of DNA b) three nucleotides that code for an amino acid c) a sequence of nucleotides in DNA that cods for a functional product d) a sequence of nucelotides in RNA that codes for a functional product e) a transcribed unit of DNA {Ans: b}The removal or destruction of all forms of microbial life is called a) sterilization b) disinfection c) pasteurization d) sanitzation {Ans: a}A culture medium consisting of agar, peptone, and beef heart is a a) chemically defined medium b) complex medium c) selective medium d) differential medium e) reducing medium {Ans: b}