Which of the following lists correctly traces the path of a sound vibration as it moves through the ear?
A. auditory canal-tympanic membrane-malleus-incus-stapes-oval window-cochlea-cochlear nerve
B. auditory canal-tympanic membrane-oval window-cochlea-malleus-incus-stapes-cochlear nerve
C. auditory canal-malleus-incus-stapes-tympanic membrane-oval window-cochlea-cochlear nerve
D. auditory canal-tympanic membrane-malleus-incus-stapes-cochlea-oval window-cochlear nerve
E. auditory canal-malleus-incus-stapes-oval window-tympanic membrane-cochlea-cochlear nerve
Answer: A
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The pathogen most frequently involved in causing clostridial myonecrosis is
A. Clostridium tetani. B. Streptococcus pyogenes. C. Clostridium septicum. D. Clostridium perfringens.
Bacteria use restriction enzymes to ____
a. integrate viral DNA b. destroy viral DNA c. prevent mutation of their DNA d. copy their genes e. inhibit the expression of some of their genes
A primary source of carbon for photosynthetic organisms is:
a. carbon dioxide in the atmosphere and water. b. bicarbonate in the water. c. nitrate in the soil. d. dissolved phosphate in water. e. carbonic acid in rain.
Which one of the following can create new alleles?
A) natural selection B) sexual reproduction C) mutation D) genetic drift