What is "social immunity"?
A. The immunity acquired by disease transmission from nest mate to nest mate.
B. The immunity acquired by lining colony nests with antimicrobial secretions.
C. The prevention of infection by quick removal of dead and diseased animals from the nest.
D. The transfer of infection resistance from immunized to susceptible organisms.
E. The immunity acquired by dilution of a pathogen's effectiveness in a large population.
D. The transfer of infection resistance from immunized to susceptible organisms.
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In modern proteomic analysis the amino acid sequence of a protein can be determined by
A. two-dimensional gel electrophoresis. B. analysis using protein chips with appropriate probes. C. mass spectrometry. D. determining its nucleotide sequence.
What is a major advantage of using a modifier screen as opposed to a primary screen?
A) Modifier screens can be used to identify pleiotropic genes. B) Modifier screens are easier to perform. C) Modifier screens use a random selection of flies based on their morphology and therefore should identify all genes involved in development. D) Modifier screens are performed with chemically mutagenized flies so all genes that affect development should be identified more rapidly than screening for spontaneous mutants.
Denitrifying bacteria:a
make nitrogen available for assimilation. b. decompose organic nitrogen compounds into nitrate. c. decompose organic nitrogen compounds into ammonia. d. fix nitrogen into ammonia. e. convert nitrate into atmospheric nitrogen.
What is the approximate number of distinct evolutionary branches in the domain Archaea, as revealed by genome sequencing studies?
a. 3 to 4 b. 9 to 10 c. at least 12 d. at least 20