Media can be either selective or differential, but they cannot be both.
a. true
b. false
Ans: b. false
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To begin transcription, RNA polymerase must bind to a segment of DNA called the ____.
A. initiation site B. primer C. inducer D. promoter E. transcription bubble
An inanimate object that may be contaminated with a pathogen is called a ________.
A. fomite B. vector C. zoonoses D. None of the choices are correct.
Net primary productivity in an ecosystem increases as mean annual temperature
A) and mean annual rainfall decrease. B) decreases and mean annual rainfall increases. C) increases and mean annual rainfall decreases. D) and mean annual rainfall increases.
Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference between Gram-positive and Gram-negative bacteria?
A. presence or absence of outer plasma membrane B. structure of nucleotides in the plasma membrane C. presence or absence of muramic acid in the cell wall D. presence or absence of peptidoglycan in the cell wall