Question

Lactobacilli, rhizobia, yeast, clostridia which one is odd and why

Answer 1

Clostridia is odd one out . All other microorganisms are useful but clostridia is harmful micro organism . It causes food poisoning.

Answer 2

Rhizobia is the odd one out. Because all others are bacteria associated with human food products.

Rhizobia:

• Rhizobia are diazotrophic bacteria that settle inside the root nodules of legumes and fix nitrogen.
• Rhizobia need a plant host in order to express their genes for nitrogen fixation; they are unable to fix nitrogen on their own.
• They are typically motile, non-sporulating, gram-negative rods.
• Rhizobia are soil bacteria with a gram-negative phenotype that attach to and colonize the root cells of legume plants, such as alfalfa and soybeans.
• Rhizobia penetrate a root hair, travels to the center of the root hair cell, and then combines with growing plant cells to form a nodule.

Lactobacillus:

• Members of the class of organisms known as lactic acid bacteria, or Lactobacillus, are characterized by the production of lactic acid as the sole or primary byproduct of the metabolism of carbohydrates.
• The rods or coccobacilli that makeup Lactobacillus are gram-positive, non-spore-forming, and typically have a G+C level below 50% mol%.

Yeast:

• Yeast is a microscopic creature with just one cell.
• Animal cells, including human cells, grow much more slowly than yeast cells do.
• Yeast is mostly used in the manufacturing of baked goods and alcoholic beverages.

Clostridia:

• The natural gut flora of people and animals, as well as soil, contain spore-forming bacilli known as clostridia.
• Although the majority of isolates are gram-positive, there are gram-negative species as well.
• Exotoxin(s) is crucial in the etiology of illness.

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