How does transcription of sporulation genes in B. subtilis involve different sigma factors?
What will be an ideal response?
Ans: Sigma factors are replaced with others that direct transcription of a new set of genes. A cascade of sigma factors is used to complete the transcription program. Most vegetative genes continue to be expressed.
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An organism was isolated after growing 26 days. Colonial morphologic appearance revealed heaped, wrinkled, moist, and yeastlike colonies. As the culture aged, colonies became covered with short aerial mycelium that turned from tan to brown. This organism is most likely:
a. Blastomyces dermatitidis. b. Coccidioides immitis. c. Histoplasma capsulatum. d. P. brasiliensis.
Staphylococcus aureus can be identified by mixing the organism with specific antibody and visually recognizing a clumping reaction between the antigen and the antibody. This is a(n) ________ test.
A. biochemical B. ELISA C. microarray D. agglutination
Cultivation of Coccidioides species to confirm a diagnosis of Valley Fever is accomplished by plating the samples on ________ agar.
A. blood B. chocolate C. Sabourad's D. birdseed
Which of the following is a neural tube defect that involves incomplete development of the brain and results in stillbirth or death shortly after birth?
A) spina bifida B) neurulation C) anencephaly D) morphogenesis