To be scientifically valid, a hypothesis must be
A) part of a theory.
B) controlled.
C) reasonable.
D) testable and falsifiable.
Answer: D
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Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?
A. They are highly permeable to test substances. B. It is very straightforward to assay the conversion of their histidine auxotrophy mutations to histidine prototrophy. C. They are defective in DNA repair and, therefore, cannot readily repair damage done by the test substances. D. All of the choices are correct.
Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose father was colorblind has children with a man with normal color vision. What is the probability that their first child will be colorblind?
A) 1/4 B) 1/2 C) 3/4 D) 0 E) 1
Evolution is the
A. slow change in the genetic makeup of a population of organisms over many generations. B. fast change in the genetic makeup of a population of organisms over many generations. C. slow change in the genetic makeup of an individual over a lifetime. D. fast change in the genetic makeup of an individual over a lifetime.
Fluorescent antibody, ELISA, and immunoblotting tests involve the use of (hybridoma/labeled/unlabeled) antibodies.
Fill in the blank(s) with the appropriate word(s).