The natural habitat of Ochrobactrum spp. can best be described as the:
a. mucous membranes of animals.
b. gastrointestinal tract of humans and other animals.
c. natural environment.
d. genitourinary tract of animals.
C
Most of the organisms discussed in Chapter 22 exist in the environment. As environmental or-ganisms, these bacteria are rarely encountered in human specimens or infections. When they are encountered, they are found on contaminated medical devices or are isolated from patients who are immunocompromised or otherwise debilitated.
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One important difference between amniocentesis and chorionic villus sampling is that ____
a. chorionic villus sampling is more routine b. amniocentesis can diagnose chromosome disorders, while chorionic villus sampling cannot c. chorionic villus sampling can be done earlier in the pregnancy than amniocentesis d. maternal risks are higher with chorionic villus sampling e. the risk of miscarriage is higher with amniocentesis than with chorionic villus sampling
A plasmid cloning vector and DNA fragments containing the XYZ gene, each digested with the same restriction
enzyme, are mixed with DNA ligase. Which product(s) will result?
a. recombinant plasmids only b. nonrecombinant plasmids only c. joined-together copies of the DNA fragment containing the XYZ gene only d. a mixture of recombinant plasmids, nonrecombinant plasmids, and joined-together copies of the DNA fragment containing the XYZ gene e. no reaction will occur because DNA polymerase rather than DNA ligase is needed to insert the DNA fragments into the plasmid cloning vector
The structure that focuses light images on
photoreceptors is indicated by a. A. b. B. c. C. d. D. e. E.
Immunological attack on the islets of Langerhans resulting in the inability to produce insulin leads to type (I/II/IV) diabetes Mellitus.
Fill in the blank(s) with the appropriate word(s).