Animal cells recognize common types of pathogen molecules and activate the production of
antimicrobial peptides.
____________________ Indicate whether the statement is true or false.
T
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Which of the following molecules inhibits bacterial transcription by prevention of promoter clearance?
A. ?-amanitin B. actinomycin D C. rifampicin D. acridine E. ethidium bromide
Which of the following statements about plasma membranes is INCORRECT?
A. They are composed of phospholipids. B. They have both integral and peripheral proteins. C. They are relatively rigid structures. D. They are composed of two leaflets of phospholipids. E. They function to separate the extracellular and intracellular environment.
The presence of hydrochloric acid in the stomach serves all of the following purposes EXCEPT
a. activates pepsinogen. b. emulsifies fats. c. inactivates amylase. d. kills bacteria. e. unfolds proteins.
Successful cotransformation in the yeast two-hybrid system will result in the binding of proteins produced by each yeast expression vector. These fusion proteins function by
A) binding to the lacZ operator, preventing transcription. B) binding to RNA polymerase, preventing transcription. C) binding to the lacZ repressor, enabling transcription. D) binding to the lacZ upstream activator sequence, enabling transcription. E) changing color in the presence of X-gal.