After a meal of raw oysters, a woman begins to feel numbness and tingling in her hands and feet. By the time she gets to the hospital, she can no longer move and is having difficulty breathing. The lab finds a protist with two flagella
The organism is a(n)
A) apicomplexan.
B) euglenozoan.
C) dinoflagellate.
D) radiolarian.
E) brown alga.
C
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An example of an "emerging virus" (a virus in a new host) with a lethality rate in excess of 50% is
A. influenza virus. B. Ebola virus. C. hepatitis B. D. variola virus. E. yellow fever.
In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. Archenteron B. Neural tube C. Notochord D. Epidermis E. Intestinal tract
What term is used to describe bacteria that can only live in the absence of oxygen?
a. aerobes b. anaerobes c. oxyphiles d. oxyphobes e. methanogens
Antibiotic resistance genes are often included on plasmid vectors because
A) antibiotic resistance is used to select for bacteria cells containing the vector. B) antibiotic resistance can be used to control the growth of the genetically modified organism. C) antibiotics are often present in humans being treated for disease. D) only bacteria are affected by antibiotics. E) antibiotic resistance genes can be used as transcriptional reporters.