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

Biology & Microbiology

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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.

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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.

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Actin bundles give shape and support to ________ found in intestinal mucosal cells

A) cilia B) flagella C) microvilli D) nuclei E) lamellipodia

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Apples, oranges, peanuts, and rice grains are produced by

A. bryophytes. B. lycophytes. C. angiosperms. D. charophytes. E. gymnosperms.

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