Care in the handling and disposal of diapers in day care centers may prevent the spread of which of the following?
A) hepatitis A virus
B) Giardia intestinalis
C) Salmonella enterica
D) Cryptosporidium parvum
E) norovirus
B
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Of the following organisms, which one is among the Aggregatibacter aphrophilus, Aggregati-bacter actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella spp. (HACEK) group of organisms that cause slowly progressive bacterial endocarditis?
a. Capnocytophaga gingivalis b. Sphingomonas paucimobilis c. E. corrodens d. A. actinomycetemcomitans
Which stage(s) is (are) the diploid sporozoite
stage(s) of the Plasmodium (malaria) parasite? a. A b. B c. C d. A and B e. none of these
Free-living developmental stages that do not resemble the adults are
A. viruses. B. embryos. C. larvae. D. fossils.
When plants undergo allopatric speciation, an initial reproductive barrier is often
A) polyploidy. B) gametic isolation. C) temporal isolation. D) pollinator choice.