What is the chemical structural backbone of a nucleic acid?
a. an amine group
b. a carboxyl group
c. a sugar-phosphate structure
d. a fatty acid chain
c
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Desulfuromonaceae and Geobacteraceae are strict anaerobic mesophilic bacteria and have been isolated from anoxic ________ environments.
What will be an ideal response?
Which of the following statements is the most accurate description of fruits and seeds?
A. "Fruits" and "seeds" are synonymous terms. B. Fruits always have fleshy coverings and seeds always have hard ones. C. Fruits are ripened ovaries containing seeds. D. Fruits have endosperm but seeds do not. E. All of the choices provided are incorrect.
Long, slender, helically curved, gram-negative bacilli with tight coils are identified as belonging to which species?
a. Treponema b. Leptospira c. Borrelia d. Coxiella
A solution with a pH of 3
A) is more alkaline than a solution with a pH of 2. B) has a higher concentration of OH- than a solution with a pH of 4. C) is neutral. D) is more acidic than a solution with a pH of 3.5.