Which of the following organisms anaerobically reduces sulfates to hydrogen sulfide or metal sulfide?

A. Desulfovibrio
B. Nitrosococcus
C. Rhizobium
D. Thiobacillus thiooxidans
E. Thiobacillus ferrooxidans


Answer: A

Biology & Microbiology

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The citric acid cycle contains how many steps?

a. 2 b. 4 c. 6 d. 8

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During extended periods of dehydration,

tardigrades a. enter suspended animation. b. migrate to the soil subsurface. c. enter small ponds and lakes. d. climb inside a plant leaf and encyst. e. none of these

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Which of the following is the largest group of hormones?

a. steroid hormones

b. polysaccharide hormones c. amino acid derivatives d. peptide hormones e. fatty acid derivatives

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Sexual selection:a

is the basis for establishing elaborate societies. b. leads to a reproductive advantage for some individuals over others of the same sex and species. c. favors monogamous mating systems. d. leads to the investment of parental care of offspring. e. is not a type of natural selection

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