A pink-pigmented facultative methylotrophic bacterium is LEAST likely to be a classified as a member of
A) Rhizobiales.
B) Rhodobacter.
C) Methylobacterium.
D) Proteobacteria.
Answer: B
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Which of the following would occur if there were a mutation in the lacO site (lac Operator) of the lac operon?
A. Binding of RNA polymerase could be hindered. B. Binding of a repressor protein could be hindered. C. Binding of the activator protein could be hindered. D. Duplication could be affected. E. The order in which the genes of the lac operon are transcribed could be altered.
In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total
number of shared electrons in CH4 is ____.
a. 4 b. 2 c. 1 d. 8 e. 5
Compare and contrast allopatric and sympatric speciation What will be an ideal response?
Which of the following vitamins is an essential nutrient in humans that cannot be synthesized by intestinal bacteria?
A) Biotin B) Vitamin B5 (pantothenic acid) C) Vitamin C (ascorbic acid) D) Folic acid E) Vitamin K