The expression of the lac operon in an E. coli cell missing the gene that encodes for the lac repressor:
A. will increase when lactose is present.
B. will decrease when lactose is present.
C. will decrease when glucose is present.
D. will increase when glucose is present.
C
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Rocky Mountain spotted fever is an example of a(n)
A. animalosis. B. tickonosis. C. plantonosis. D. zoonosis.
Hemophilia is characterized by ____
a. defects in the mechanism of blood clotting b. an extremely low blood iron level c. jaundice of the eyes and skin d. muscular weakness and atrophy e. breathing difficulties
Beta-lactam antibiotics have an effect on which of the following types of cells?
A) animal cells B) bacterial cells C) fungal cells D) virus-infected cells E) both animal and fungal cells
How can endospore-forming Firmicutes be selected?
a. by creating an anoxic environment b. by heating the sample for 10 min at 80°C c. by treatment with a strong dosage of ethylene gas d. none of the above