Which of the following places the steps in the correct sequence? 1-Staining 2-Making a smear 3-Fixing
A) 1-2-3
B) 3-2-1
C) 2-3-1
D) 1-3-2
E) The order is unimportant.
C
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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.
Once transduction of a signal is complete, the receptor and its bound signaling molecule are removed from the cell
surface by ____.
a. hydrolysis b. diffusion c. endocytosis d. pinocytosis e. exocytosis
A gene mutation
a. is a change in the nucleotide sequence of DNA. b. may be harmful. c. may arise spontaneously. d. may have no effect. e. is true of all of these
There is genetic evidence of interbreeding
between Homo neanderthalensis and H. sapiens about ___ years ago but not after ___ years ago.
a. 6000---4000 b. 60,000---40,000 c. 600,000---400,000 d. 600---400 e. there is no genetic evidence of interbreeding between these two species