spermatidWhich structure contains 46 chromosomes?
a. egg
b. zygote
c. secondary oocyte
d. polar body
e. spermatid
ANSWER: b
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The most likely identification of an anaerobic gram-positive bacillus that produces spores is:
a. Bifidobacterium. b. Eubacterium. c. Eggerthella. d. Clostridium.
Which clinical feature is a common finding for infants with trisomy 21, trisomy 18, and trisomy 13?
A. Rocker bottom feet B. Single palmar crease C. Small, close-set eyes D. Cleft lip (with or without cleft palate)
The organism with the highest fitness is
A. an animal that lives 2 years and produces 10 offspring per year. B. an animal that lives 10 years and produces 2 offspring per year. C. an animal that lives one year and produces 10 offspring total. D. an animal that lives 10 years and produces 10 offspring per year. E. an animal that lives 100 years and produces 10 offspring total.
Streptomyces differs from Actinomyces because Streptomyces
A) makes antibiotics. B) produces conidia. C) forms filaments. D) is a strict aerobe. E) is a bacterium.