A 30-year-old woman was hospitalized after she experienced convulsions. On examination, she was alert and oriented and complained of a fever, headache, and stiff neck. Which of the following is most likely to provide rapid identification of the cause of her symptoms?
A) Gram stain of cerebrospinal fluid
B) Gram stain of throat culture
C) biopsy of brain tissue
D) check serum antibodies
E) None of these would provide rapid identification.
A
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What process(es) are required for phospholipids to flip-flop across the lipid bilayer?
A. The process requires energy. B. The process occurs spontaneously, requiring no energy. C. The process requires an enzyme called flippase. D. The process requires energy and the flippase enzyme. E. The process occurs spontaneously and requires the flippase enzyme.
Speciation occurs ____
a. after populations become reproductively isolated b. when mutations generate observable differences c. when transitional forms develop between different populations d. when natural selection pressures reach their maximum e. randomly as mutations build up in a population
It took more than 100,000 years for the human population to grow to one billion individuals and took about ____ years
to add five billion more. a. 200 b. 20,000 c. 100,000
d. 200,000 e. 500,000
Which of the following does NOT produce an exotoxin?
a. Bordetella pertussis b. Corynebacterium diphtheriae c. Mycobacterium tuberculosis d. Streptococcus pygogenes e. All of these produce an exotoxin.