Most evidence indicates that skin color is controlled by how many gene pairs?
A. One
B. Two to three
C. Three to four
D. Five to seven
E. More than twelve
C
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In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at is a protostome and not a deuterostome?
A) There is evidence of cephalization. B) You see a well-developed coelom. C) The animal is triploblastic. D) The animal is clearly bilaterally symmetrical. E) You see a mouth, but not an anus.
The primary plating medium used to select out Clostridia spp. would be:
a. anaerobic blood agar. b. laked kanamycin-vancomycin (LKV) blood agar. c. phenylethyl alcohol agar (PEA). d. thioglycollate.
Visible light comprises wavelengths that vary between ____ nanometers
a. 380 and 750 b. 350 and 750 c. 390 and 780 d. 340 and 740 e. 320 and 740
Which of the following factors DOES NOT influence the degree of killing of microorganisms?
A. Concentration of disinfecting agent B. type of organisms C. number of organisms present D. oxygen content of the environment