Immunodiffusion tests
A. allow detection of specific antigens.
B. are a simple method that produces visible results in the zone of optimal proportion.
C. allow quantitation of antigen concentrations.
D. All of the choices are correct.
D
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The time it takes for half of a radioisotope’s atoms to
decay a. cannot be calculated. b. is used to construct the geologic time scale. c. is its half-life. d. is the same for uranium 238 and carbon 14. e. is all of these.
The plant hormone that promotes fruit ripening is ____.
A. auxin B. gibberellin C. cytokinin D. abscisic acid E. ethylene
Which category of biochemical tests is incorrectly matched with its description?
A) Amino acid catabolism tests: Detect specific enzymes involved in catabolism of amino acids B) Oxidase and catalase tests: Identifies the presence of enzymes related to anaerobic respiratory chains C) Fermentation tests: Detects various fermentation end-products or specific pathways D) Rapid identification techniques: Provides a semi-automated process of running multiple types of tests with a single inoculation E) Exoenzyme tests: Detect enzymes involved in extra-cellular breakdown of macromolecules