Which of the following describes the curve labeled “D” on graph?
a. a primary response to the initial antigen
b. a secondary response to the initial antigen
c. a primary response to an antigen distinctly different from the initial antigen
d. a secondary response to an antigen distinctly different from the initial antigen
e. none of the these
B
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The lacA gene found within the lac operon encodes for galactosidase transacetylase. This enzyme attaches a(n) ________ group to lactose and lactose analogs.
A. amino B. hydroxyl C. carbonyl D. acetyl E. carboxyl
Parapatric speciation occurs most often ____
a. within in the same home range b. populations inhabiting different areas while maintaining contact along a common border c. within a group of interbreeding populations d. on either side of geographic barriers e. by polyploidy
The ____ are a group of parasitic fungi that are killing amphibians around the world
a. Chytrids b. ascomycetes c. basidiomycetes d. glomeromycetes e. Zygomycetes
If media A is pH 9 and media B is pH 7, then the media at pH 9 is _________________ times more alkaline than the pH 7 media.
A) 100 B) 1000 C) 10 D) 20 E) 2