Infectious disease weekly question

___organisms have thin peptidoglycan cell walls with lypopolysaccharide outer membranes. They lose the crystal violet/iodine complex during the decolorizing step and are visualized using the safranin counterstain

Gram-negative

An organism that is a late or slow lactose fermenter possesses:

Only β-galactosidase

In capnophilic incubators, carbon dioxide concentrations should be maintained between

5%-10%

A mordant that is applied after the primary stain to chemically bond the alkaline dye to the bacterial cell wall is which of the following?

Gram’s iodine

Spores are found in select groups of bacteria. Which of the following statements describes the major advantage to the bacteria that possess these structures?

Spores are resistant to heat, cold, drying, most chemicals, and boiling

Innate, or natural, immunity involves which of the following mechanisms?

Mucus and cilia in the respiratory tract that help to trap and clear microorganisms

The _ are important for motility of the bacteria cell

Flagella

Fermentation end-products are often used to aid in the identification of bacteria. Fermentation results in which of the following:

Lactic acid, mixed acids, alcohols, and CO2 production

The medium used to determine whether an organism is oxidative or fermentative with respect to its metabolic activities is

OF medium

A bacterium that grows only on plates incubated in the absence of oxygen would be categorized as

Obligate anaerobe