Isolates from an ear swab that are gram-negative coccobacilli grow on chocolate agar in CO2 but not blood agar, require both X and V factors for growth, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae.
b. H. ducreyi.
c. H. aphrophilus.
d. H. influenzae.
D
All characteristics listed are those that describe H. influenzae, which is commonly implicated in otitis media.
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What is true of most deciduous trees in the temperate zone?
a. they spend all of their energy on reproduction b. growth and reproduction occur simultaneously c. they only produce one or two offspring annually d. they produce thousands of seeds for one or two years e. they only begin to breed after reaching adulthood
Elements differ from each other in their
a. physical properties only. b. atomic number only. c. type of subatomic particles. d. physical properties and atomic number. e. type of electrons.
Which of the following represents a testcross?
a. RrMm ? RrMm b. RRMM ? rrmm c. rrMM ? RRmm d. RrMm ? rrmm
Which of the following is true of zinc?
a. It binds to most proteins in the body. b. Grains are the most reliable food sources of zinc. c. Excess zinc can decrease copper absorption. d. All of its functions involve it acting as a co-factor for enzymes.