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Micro 202 Lab NDSU Exam with Complete Solutions

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Micro 202 Lab NDSU Exam with Complete Solutions Differential medium - Answer-Special characteristics that differentiate microbes based on physical appearance Serial dilution - Answer-Scientists first dilute the sample several times in a series to get a countable number Simple stain - Answer...

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  • August 27, 2024
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Micro 202 Lab NDSU Exam
with Complete Solutions
Differential medium - Answer-Special characteristics that differentiate microbes based
on physical appearance

Serial dilution - Answer-Scientists first dilute the sample several times in a series to get
a countable number

Simple stain - Answer-Apply a single dye to differentiate between cells and background

Sterilization - Answer-eliminates all forms of life

Stock Culture - Answer-pure culture that's in use

Bacillus cereus - Answer-gram positive that stains purple

Bacillus polymyxa - Answer-breaks down starch and casein

Bacillus stearothermophilus - Answer-Thermophile, turns yellow at high temp, ferments
sugar

Clostridium sporogenes - Answer-Obligate anaerobe, grows on bottom of tube

E. Coli B - Answer-E coli, bacteriophage strain, lyses bacterial cells to show plaques

Enterobacter aerogenes - Answer-non-fecal coliform

Escherichia coli - Answer-gram negative, unaffected by some antibiotics, doesn't
hydrolysis casein or starch

Micrococcus luteus - Answer-growth is most inhibited by antibiotics, cocci

Mycobacterium phlei - Answer-Stains red in acid-fast

Pseudomonas aeruginosa - Answer-most unaffected by antibiotic

Serratia marcescens - Answer-is red

Staphylococcus aureus - Answer-Inhabitant of the nose, can cause disease

, Staphylococcus epidermis - Answer-Inhabitant of the skin, not a pathogen

Streptomyces griseus - Answer-found in soil, is an actinomycete, antibiotics come from
this

Saccharomyces cerebisiae - Answer-Used in bread, beer, and fuel making, dead are
blue, live is clear

Aspergillus niger - Answer-Bread mold, look like broom

Rhizopus nigricans - Answer-Has sporangium, look like mushroom

Blood agar - Answer-Differential medium, shows the ability to break down red blood
cells


Acid Fast Stains What for positive - Answer-Red

Actinomycetes - Answer-Found in soil, bacteria that acts like fungus, many
antimicrobials come from these

Aerobic respiration - Answer-Generates most ATP, needs oxygen

Anaerobic respiration - Answer-Generates second most ATP, doesn't need oxygen

Antibiotic resistance - Answer-Bacteria that become resistant to antibiotics through bad
medical practice eventually reproduce more, and become more common

Antibiotics - Answer-Substances produced by living organisms that kill or inhibit other
microbes

Antibodies - Answer-Highly specific proteins that recognize and protect against antigens

Antigen - Answer-a molecule that induces an immune response

Antimicrobials - Answer-Chemicals that either kill or inhibit microbes

Antiseptics - Answer-Chemicals used on skin lesions to kill or inhibit pathogens

Aseptic techniques - Answer-How to pour plates, streak plates, and transfer bacteria
without cross contamination

Autoclaving - Answer-121 Degrees Celsius for 15 minutes, at 15 PSI

Pasteurization - Answer-Heat treatment at 72 degrees celsius for 15 seconds that kills
pathogens and non pathogens in liquids like milk wine etc

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