The natural habitat of the bacterium Sphingobacterium is:
a. environment.
b. animal oral and respiratory flora.
c. environment, cold climates.
d. human normal flora.
A
The organisms that constitute the genera discussed in this chapter are environmental inhabitants that are occasionally encountered in human specimens. As environmental inhabitants, these or-ganisms may be found in various niches in the environment. Most notable in terms of clinical relevance is their ability to survive in hospital environments, especially in moist areas.
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In eukaryotes, the 3' poly-A tail is attached to
A. poly-A polymerase. B. mRNA. C. tRNA. D. the ribosome. E. the template strand of DNA.
I've cloned a genomic library and know that my bacteria have foreign DNA fragments inserted into the
cloning vector. I now need to identify the specific bacteria that have the gene coding for protein X. How can I locate these bacteria?
a. DNA hybridization of the different colonies b. PCR of the same bacterial mixture that was spread on agarose plates c. restriction endonuclease treatment of DNA from some of the bacterial colonies d. agarose gel electrophoresis of DNA isolated from the bacterial colonies e. transfer the bacterial colonies to filter paper
Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.
Lipids with unsaturated fatty acids
a. decrease the fluidity of membranes. b. increase the charge associated with the inner face of a membrane. c. increase the fluidity of membranes. d. are present only on the inner side of the plasma membrane.