All of the following pertain to cephalosporins except
A. greater resistance to beta-lactamases.
B. newer generations have activity against gram negatives.
C. many administered by injection not orally.
D. they have a beta-lactam ring.
E. they are synthetic drugs.
Answer: E
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Which of the following statements about australopiths is true? a. Thin-enameled molars hint that the australopiths must have eaten a diet of soft plants and tender meat
b. Dentition shows that australopiths were carnivores. c. Australopith footprints found in Tanzania by Mary Leakey proved that they moved by knuckle-walking like modern gorillas. d. Fossils and footprints indicate that all australopiths walked upright.
Molecules that resemble fats but contain phosphate functional groups are called
A. steroids. B. polypeptides. C. phospholipids. D. nucleic acid.
A microbiology student sampled a site that did not produce any colony growth on the nutrient agar, nor any turbidity in the nutrient broth after 48 hours. What steps could she take to further determine if microbes are present at her sample site?
A) Incubate the nutrient agar plates and broth for longer than 48 hours B) Inoculate enriched media as well as nutrient agar/nutrient broth C) Resample the site at different times of day D) Take multiple samples from the same site E) All of the above
During REM sleep, an EEG shows
A) a flat trace with very few waves. B) a pattern that is similar to when a person is in deep sleep. C) an irregular, rapidly changing pattern.