A distinctive feature of spirochetes is the presence of
A. endoflagella.
B. nucleosomes.
C. fimbriae.
D. variable surface antigens.
E. helically arranged pili.
Ans: A. endoflagella.
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An example of a phenotypic trait where observation of phenotype can easily identify the genetic variation is:
A. color markings in certain invertebrates. B. human skin color. C. human blood type. D. color markings in certain invertebrates and human blood type. E. human skin color and blood type.
The formation of amino acids under abiotic
conditions was important because they serve as a. a supply of structural units for proteins. b. enzymes to catalyze reactions. c. subunits in the formation of DNA. d. subunits in the formation of RNA. e. subunits for the formation of lipids.
An individual who works in construction and is exposed to years of loud noises, below 75 decibels, will most likely develop a decease in hearing function. The structures that are damaged are the
A. organ of Corti. B. round window. C. auditory canal. D. tympanic membrane. E. stereocilia of the spiral organ.
One of the most viable indicators of evolutionary relatedness and affiliation is a comparison of the sequence of nitrogen bases in ribosomal RNA.
a. true b. false