A vibriostatic test using 0/129 (2,4-diamino-6,7-diisopropylpteridine)–impregnated disks differentiates vibrio cells, which are susceptible, and _________, which are resistant
a. Enterobacteriaceae
b. Plesiomonas spp.
c. aeromonads
d. Chromobacterium spp.
C
A vibriostatic test using 0/129-impregnated disks is performed to separate Vibrios spp. (suscepti-ble) from other oxidase-positive glucose fermenters (resistant) such as aeromonads and to diffe-rentiate V. cholerae 01 and non-01 (susceptible) from other Vibrio spp. (resistant). However, re-cent strains of V. cholerae 0139 have demonstrated resistance; therefore the dependability of this test is questionable.
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What kind of mutation occurs when one base is changed to another at a single location in the DNA?
A) Insertion B) Neutral C) Deletion D) Substitution
Which of the following accounts for the negative control of operons?
A. Promoters B. Repressors C. Structural genes D. Operators E. Deactivators
Events that occur during transcriptional regulation in eukaryotes include
A. mRNA translation. B. chromatin conversion to a closed conformation. C. DNA replication. D. polypeptide synthesis. E. RNA processing and export from the nucleus.
What is the function of the centromere?
A. to attach the DNA to the plasma membrane B. to attach the chromosome to the spindle C. to attach the sister chromatids to each other D. to organize the microtubules to form a spindle