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MCB2010 Final Exam (1) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution $7.99   Add to cart

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MCB2010 Final Exam (1) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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MCB2010 Final Exam (1) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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  • June 19, 2024
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MCB2010 Final Exam
differential stain - ANS-react differently with different kinds of bacteria and thus can be
used to distinguish them

How many dyes for differential stain? - ANS-2 dyes (basic w/ contrasting color)
ex. Crystal violet & safranin or Carbolfuschin & methylene blue

What does differential staining stain? - ANS-Eubacteria Kingdom

Differential Staining Steps - ANS-After smear prep...
1. Apply first dye (primary stain)
2. Apply mordant (secures color to stain)
3. Apply decolorizing agent (removes dyes from some cells)
4. Rinse w/ water. Add counterstain safranin.

Chemical groups of dyes in differential staining - ANS-basic dyes

Gram stain results - ANS-Purple (primary dye) = positive
Red (counterstain) = negative

Why bacteria have a reaction to gram stain? - ANS-- due to the cell wall
- cell wall = peptidoglycan (disaccharide+protein)
- archaea can't be stained because the cell wall lacks peptidoglycan

Why do bacteria react differently to gram stain? - ANS-- different layers of peptidoglycan
(thicker)

Gram's Bacteria - ANS-- streptococcus pneumonia (+)
- Klebsiella pneumonia (-)

Peptidoglycan - ANS-Gram-positive bacteria cell walls have multiple layers, while
Gram-negative bacteria cell walls have a single layer of peptidoglycan covered by a
thick outer-membrane of lipids

Teichoic Acids - ANS-exclusive component of Gram-positive bacterial cell wall( about
10%). Sometimes, it extends to the plasma membrane as Lipoteichoic acid

lipotechoic - ANS-in gram positive, linked to plasma membrane

, Lipo-polysaccharides - ANS-outer membrane of gram - bacteria

Peptidoglycan in Gram + - ANS-90-95%

Peptidoglycan in Gram - - ANS-15%

Effect of Antibiotics - ANS-kill gram + bacteria, cannot kill gram - bacteria

Carl Weiger - ANS-added counterstain procedure to Gram stain to reveal bacteria in the
cells of infected tissue

Periplasmic Space - ANS-The space between the inner and outer cell membranes in
Gram-negative bacteria

What toxins are produced by Gram positive bacteria? - ANS-Exotoxins

What Toxins are produced by Gram negative bacteria? - ANS-Endotoxin and exotoxins

Flagellar Structure of Gram positive bacteria - ANS-2 rings in basal body

Flagellar Structure of Gram negative bacteria - ANS-4 rings in basal body

Gram positive susceptibility to Penicillin - ANS-High

Gram negative susceptibility to Penicillin - ANS-Low

Gram positive susceptibility to Anionic Detergents - ANS-High

Gram negative susceptibility to Anionic Detergents - ANS-Low

Vital Characteristics of Microbial Life - ANS-1. Irritability
2. Nutrition
3. Growth
4. Reproduction
5. Movement
6. Respiration
7. Excretion (getting rid of metabolic waste)

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