Which 3 terms correctly describe the kind of bacteria most likely to form pink colonies in...

Which 3 terms correctly describe the kind of bacteria most likely to form pink colonies in toilets and bathtubs?

		Alphaproteobacteria
		Rhizobiales
		Methylobacterium sp.
		Betaproteobacteria
		Serratia marcescens
		Chromobacterium violaceum
		Gammaproteobacteria

The causative agents of Typhus and Rocky Mountain Fever are members of which group of bacteria listed below?

There are 2 correct answers.

		Rickettsiales
		Gammaproteobacteria
		Alphaproteobacteria
		Pseudomonadales
		Betaproteobacteria
		Neisseriales
		Burkholderiales

Rhizobiales, a nitrogen-fixing group of bacteria, are part of which sub group of proteobacteria?

		Betaproteobacteria
		Deltaproteobacteria
		Epsilonproteobacteria
		Gammaproteobacteria
		Alphaproteobacteria

Expert Solution

1. The correct answer is Methylobacterium sp, Serrata marcescens, Gammaproteobacteria

Methylobacterium sp, Serrata marcescens, Gammaproteobacteria are the 3 kinds of bacteria that form a pink or red slime-like mold in toilets and bathtubs. These tend to grow in moist places and bathtubs and toilets are favorable habitats for them to grow. First, they appear as small spots, and eventually, they spread or grow in other fertile places. Basically, Serrata marcescens belong to the proteobacterium class of Gammaproteobacteria.

2. The correct answer is Rickettsiales and Alphaproteobacteria

The causative agents for Typhus and Rocky mountain fever are Rickettsiales species. These are transmitted by ticks, mice and other insects. They are gram-negative, nonmotile, and cocci in shape. The causative agent for typhus is Rickettsia typhi. This group of bacteria belongs to the class of alphaproteobacteria. These comprise of intracellular pathogens like rickettsia, symbionts of plants like rhizobium, and other several genera.

3. The correct answer is Alphaproteobacteria

Rhizobiales which are nitrogen-fixing bacteria basically belong to a class of alphaproteobacteria. These are gram-negative in nature and they live either as free-living soil bacteria or by their interaction with roots of leguminous plants.

gladiator answered 1 year ago

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