Organisms such as Streptococcus pyogenes and Staphylococcus aureus that produce leukocidins are called ________ pathogens

A) pyogenic
B) radical
C) enterotoxigenic
D) hemorrhagic


Answer: A

Biology & Microbiology

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The bacterium E. coli swims in a straight line, called a ________, for a few seconds; then it stops, tumbles, then swims away in a new direction.

Fill in the blank(s) with the appropriate word(s).

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Which of the following are living cells?

a. tracheids b. cork c. sclereids d. parenchyma e. vessel members

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Fragile X syndrome:a

results in learning, attention, and hyperactivity disabilities in males. b. is not inherited from the parents. c. is characterized by a fragile site at the tip of the Y chromosome. d. results from a deletion of CGG sequences in the fragile X gene. e. is due to genomic imprinting..

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Which of the following has the strongest influence on the ability of a male white-crowned sparrow to sing at all?

a. acoustical stimuli b. social interaction with any songbird c. visual stimuli d. social interaction with other white-crowned sparrows e. innate behaviors

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