Lipopolysaccharide of the outer membrane of gram-negative cell walls is called ________.
A. enterotoxin
B. leukocidin
C. exotoxin
D. hemolysin
E. endotoxin
Answer: E
Biology & Microbiology
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The earliest evidence of biochemical reactions by living cells dates to about ____ billion years ago
a. 0.5 b. 1 c. 1.5 d. 2 e. 3.7
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Four of the five processes listed below are involved
in the same biogeochemical cycle. Select the exception. a. evaporation b. precipitation c. weathering d. surface flow e. groundwater flow
Biology & Microbiology
A(n) __________ is an organ that allows exchange of nutrients between an embryo and its mother.
Fill in the blank(s) with the appropriate word(s).
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