Although penicillin inhibits peptidoglycan synthesis, bacterial cells will continue to grow normally in the presence of penicillin in a(n) ________ environment.
A. nonpolar
B. isotonic
C. hypotonic
D. hypertonic
Answer: B
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In the process of isolating DNA for transcription and translation, you digest the DNA with BamHI and ligate the gene into a plasmid vector. However, even though all of the controls work, no transcription is obtained using your fragment. Working backward, you note that restriction digestion has removed approximately 250 base pairs from the 5' end of the gene. It is possible that during restriction
digestion A) the termination signal was removed. B) the RNA polymerase became inactivated. C) primase could not bind. D) the promoter was removed E) none of the above
Which of the following statements is true about susceptibility testing or treatment of P. aeruginosa?
a. Susceptibility testing is required to detect intrinsic resistance. b. Repeat susceptibility testing may be needed to monitor development of resis-tance. c. Susceptibility testing of isolates from cys-tic fibrosis patients following standard protocols gives reliable results. d. Treatment with a single antimicrobial agent, such as <-lactam with antipseu-domonal activity, is recommended.
The bacterium E. coli swims in a straight line, called a ________, for a few seconds; then it stops, tumbles, then swims away in a new direction.
Fill in the blank(s) with the appropriate word(s).
Internationally, the use of ricin as a weapon is banned in most countries according to the ____
a. Madrid protocol b. Paris protocol c. Kyoto protocol d. Geneva protocol e. Vienna protocol