Which of the following streptococci is associated with dental caries?
A. viridans streptococci
B. Streptococcus pyogenes
C. Streptococcus pneumoniae
D. Streptococcus equisimilis
E. Streptococcus arginosus
Answer: A
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When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:
A. the trait has a strong genetic component. B. the trait has a strong environmental component. C. the trait has a strong genotype-byenvironment interaction. D. the trait has a strong norm of reaction. E. the trait has both a strong genetic component and a strong norm of reaction.
Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. a population becomes geographically isolated. B. two populations of the same species merge to form a single population. C. polyploidy must first arise. D. hybrid zones form. E. there are no physcial barriers against interbreeding.
Actin bundles give shape and support to ________ found in intestinal mucosal cells
A) cilia B) flagella C) microvilli D) nuclei E) lamellipodia
Apples, oranges, peanuts, and rice grains are produced by
A. bryophytes. B. lycophytes. C. angiosperms. D. charophytes. E. gymnosperms.