Quality control is set up on a new lot of an indole reagent. Clostridium bifermentans and Clostridium bolteae are used, and the following results are obtained: • C. bifermentans: positive • C. bolteae: negative Which one of the following statements explains this discrepancy?
a. The reagent is most likely expired.
b. The incubation time is most likely abbre-viated.
c. These two organisms are poor choices; both are indole-positive.
d. No discrepancy is present. The results ob-tained are correct.
D
C. bifermentans and C. bolteae are positive and negative for indole, respectively; therefore the results are accurate, and the new lot is validated.
You might also like to view...
Accommodation refers to the adjustment of the lens curvature by the ciliary muscle when you focus on near or far objects.
a. true b. false
Carrie Buck is significant in the history of genetics because she ____
a. was a well-known advocate for eugenics b. became the first woman geneticist c. was sterilized after the U.S. Supreme Court determined she was feebleminded d. discovered how to genetically modify corn to be resistant to herbicides e. is the author of the first biography of Gregor Mendel
How does the circulatory system of an annelid differ from the circulatory system of a gastropod?
What will be an ideal response?
Of the following modes of HIV transmission, which is the least common mode and rare in many countries?
A. needle sharing among IV drug users B. vaginal/rectal intercourse with an infected person C. oral-genital contact with an infected person D. transfusions of infected blood E. babies born to HIV-infected women