Dental Hygiene National Board exam questions and answers with complete solutions verified graded a++

Dental Hygiene National Board exam questions and answers with complete solutions verified graded a++ Leave the first rating Terms in this set (221) How are bacteria grouped? according to their morphological and metabolic biochemical differences Why are bacteria stained? to determine shape of organism What are the main shapes of bacteria? round, rod etc... Why is staining necessary? because bacteria is colorless and invisible to light microscopy What is the most useful microbiological staining technique? gram staining What 2 groups does the gram stain separate organisms into? gram negative and gram positive what color is the gram stain if it is positive? blue what color is the gram stain if it is negative? red What does different gram stains mean? the differences in the cell walls True or False Gram negative cells are harder to kill than gram positive cells? True Is there an endotoxin inside of a gram positive cell? NO Is there an endotoxin inside of a gram negative cell? outer cell membrane contain endotoxin (lipid A) This cell wall is very thick, contains teichoic acid, is vulnerable to penicillins and lysosomes, does not block diffusion of antibiotics, has 2 layers, a low lipid content, and no periplasmic space or porin channel? Gram positive cell wall The cell wall is very thin , contains murein lipoprotein, contains 3 layers, a high lipid content, has a periplasmic and porin channel, block diffusion of antibiotics and substances that attack cell like penicillin? Gram negative cell wall Are all organisms susceptible to gram staining? NO What are 2 microorganisms not susceptible to gram staining? Mycobacteria and Spirochetes What type of staining is required for Mycobacteria? acid-fast stain What type of staining is required for Spirochetes? dark-feild microscopy What bacteria causes tuberculosis? Mycobacterium tuberculosis Is tuberculosis considered a virus or fungus? No, it is causes by a bacterial infection