Question

In: Biology

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

Solutions

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.


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