34. Which of the following bacteria counting methods requires the use of a microscope? A.Coulter counter B.Petroff-Hause

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34. Which of the following bacteria counting
methods requires the use of a microscope?
A.Coulter counter
B.Petroff-Hauser counting chamber
C. Flow cytometry
D. All of the choices A, B & C use a microscope
35. Which of the following MPN direct counting method
characteristics is true?
A.Statistical method
B.Good for high numbers of bacteria (>1600/100 ml)
C.Uses one tube for analysis
D.Can only be used for anaerobes
44. Which of the following sterilization instruments
functions must be used to sterilize dry powders?
A.Cake filter with small pores
B.a dessicator set to 1% humidity
C.a pressure cooker at 25 psi
D.dry heat oven at 170 Centigrade
48. Which enzyme is required in the extension stage
of PCR?
A.DNA polymerase
B.Ligase
C.Reverse trasncriptase
D.Blunt-end restriction endonuclease
50. Which of the following methods can lead to the
mixing of ALL the
chromosomes of two different cells?
A.protoplast fusion
B.transformation
C.extrapolation
D. all of the choices a, b, & c are correct