Lab exam 2 micro

Differential media include ingredients that allow us to visually differentiate __________ based on metabolic features.

one group of bacteria from another.

Selective media contain ingredients that __________ certain bacteria from growing.

prevent the growth of.

Defined media are precisely known and quantified, meaning they are __________ reproducible.

accurately.

Complex media contains ingredients such as __________, blood, or yeast extracts.

milk proteins.

Examples of differential media include __________ agar.

starch.

Examples of selective media include __________ agar.

PEA.

__________ agar is an example of medium that is both selective and differential.

EMB.

Medium components that make the medium undefined often include __________ proteins and yeast extracts.

milk.

The characteristic feature of selective media is to inhibit __________ of certain bacteria.

growth.

Differential media works by differentiating groups of bacteria based on their __________ features.

metabolic.

A common indicator added to media that changes color due to pH is __________.

phenol red.

Substances added to a culture plate that visually change color are known as __________.

indicators.

Mannitol salts agar (MSA) can be used to isolate __________.

gram-positive cocci.

Common gram-positive cocci found in human samples include __________ and S. aureus.

S. epidermis.

The family __________ is significant due to increasing antibiotic resistance.

Enterobacteriaceae.

The term __________ refers to bacteria that are found in the intestinal tract and can ferment glucose.

enteric.

____________ refers to a subgroup of enteric bacteria that are present in animals' feces.

Coliforms.

Selective media can be used in clinical microbiology to isolate __________ pathogens.

human.

In environmental microbiology, selective media can be used to isolate pathogens from __________ supplies.

water.

'Sensitivity' in a test refers to the ability to correctly identify __________ individuals.

those who have a disease.

'Specificity' in a test refers to correctly identifying individuals who __________ have a disease.

do not.

The IMViC acronym stands for Indole, Methyl red, Voges-Proskauer, and __________ tests.

Citrate.

Mixed acid fermentation produces end-products like lactate and __________.

ethanol.

Methyl red indicates a positive result at a pH of __________ or lower.

4.4.

In the citrate test, a positive result results in a color change to __________ when pH is above 7.6.

blue.

Positive sulfur reduction is indicated by __________ gas production.

hydrogen sulfide.

Cysteine desulfurase catalyzes the hydrolysis of __________ to produce hydrogen sulfide.

cysteine.

E. coli is positive for indole production while __________ is negative.

Enterobacter aerogenes.

The three components of phenol red broth are a protein source, __________, and a carbohydrate.

phenol red.

During cellular respiration, hydrogen peroxide is formed as a byproduct of __________ leakage.

electron.

A positive oxidase test is indicated by a __________ color change.

purple.

In nitrate reduction, the absence of color change after reagents means the test can be confirmed by adding __________.

zinc.