Hfr transfer involves all of the following except
A. a pilus connection between F+ and F- cells.
B. high frequency transfer.
C. gene integration into the bacterial chromosome.
D. F factor is part of the F+ donor chromosome.
E. independent plasmid transfer.
Answer: E
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Enteric bacteria such as Salmonella spp., Shigella spp., and Escherichia spp. most often contaminate and spoil
A) meat. B) fruits. C) grains. D) milk and milk products.
____detect changes in pressure and convert this stimulus energy into ____
a. Thermoreceptors; action potentials b. Mechanoreceptors; action potentials c. Chemoreceptors; resting potentials d. Photoreceptors; resting potentials e. Osmoreceptors; threshold potentials
An accurate contrast between radial and bilateral symmetry among animals is that
A. mirrored arrangement of body components is common with radial symmetry, but not found at all in bilateral symmetry. B. body components are arranged around a central axis in radial symmetry, but are arranged with a distinct left and right in bilateral symmetry. C. radial symmetry only occurs in round organisms like the sponges, while bilateral symmetry is common to all of the more complex animals. D. animals with radial symmetry demonstrate cephalization, while those with bilateral symmetry do not. E. radial symmetry is characterized by the animal having a coelom, while bilateral symmetry has no coelom in the animal body.
Entamoeba histolytica is acquired by
A. sexual contact. B. contaminated water. C. contaminated food. D. ingestion of cysts of the pathogen. E. All of the choices are correct.