Which of the following bacteria produce one of the most deadly bacterial toxins known?
A) Clostridium perfringens
B) Clostridium difficile
C) Clostridium tetani
D) Clostridium botulinum
E) Corynebacterium species
D
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Some mice, known as ________ mice, are genetically bred to be missing particular genes.
Fill in the blank(s) with the appropriate word(s).
Nitrogen is made available to plants for their use by the process(es) of
a. ammonification only. b. nitrification only. c. nitrogen fixation only. d. ammonification and nitrification only. e. ammonification, nitrification, and nitrogen fixation.
Nitrogen, with an atomic number of 7, has
____ electrons in the first energy level and ____ electrons in the second energy level. a. 1; 6 b. 2; 5 c. 3; 4 d. 4; 3 e. 5; 2
Table sugar is ________
A) glucose, a monosaccharide B) glucose, a disaccharide C) sucrose, a monosaccharide D) sucrose, a disaccharide