B. pertussis colonies growing on Regan-Lowe medium yields which of the following colonial morphologic appearances?
a. Star-shaped colonies
b. Mercury-drop colonies
c. Yellow-pigmented colonies
d. Shiny black-pigmented colonies
B
Young colonies of B. pertussis and B. parapertussis are small and shiny, resembling mercury drops; colonies become whitish-gray with age (Figure 37-1).
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What blood type is called the universal donor?
A. O- B. AB+ C. Ab- D. O+
During the process of ____, blastomeres undergo extensive cellular rearrangements to produce an embryo with three
distinct primary cell layers.
a. induction b. cleavage c. organogenesis d. metamorphosis e. gastrulation
In the offspring resulting from an F1 testcross, what percentage of recombinant phenotypes is expected if the genes under study are independently assorting?
A) 5% B) 33% C) 50% D) 90% E) The percentage cannot be predicted.
What is the role of the RISC complex in RNAi?
What will be an ideal response?