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ASU Daydif MIC 205 Exam 2 Spring 2024 – Q’s and A’s
ASU Daydif MIC 205 Exam 2 Spring 2024 – Q’s and A’s
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ASU Daydif MIC 205 Exam 2 Spring 2024– Q’s and A’s
In terms of microbes, growth refers to... - - an increase in cell number
(reproduction)
- Discrete Colony - - Aggregation of cells visible on surface of solid media
- Dispersed Cells - - single cells suspended in liquid media
- Complex Biofilm - - Community of one or more species of bacteria
- Bacterial populations experience ____ growth - - Logarithmic
- Four considerations for clinical sampling - - - Proper specimen
- Technique
- Timely delivery
- Proper culture methods
- Have the majority of microorganisms been grown in cultures? - - No
- Defined (synthetic) media - - All components and their concentrations are
known
- Complex media - - Nutrient rich but poorly defined
- Selective media - - Suppress growth of unwanted bacteria and encourage
growth of desired microbes
- Phases of microbial growth - - lag phase, log phase, stationary phase,
death phase
- What phase of growth will microorganism be
most sensitive to antimicrobials? - - Log phase
- Microbes often are classified according to their ______ and ______
requirements - - nutritional and physical
- Phototroph - - Acquires energy from sunlight
- Chemotroph - - Acquires energy from organic/inorganic molecules
- Autotroph - - "Self feeders," make their own food
, - Heterotroph - - "Different feeders," get carbon from other organisms
- Aerobes - - - Need oxygen to grow
- Can detoxify toxic forms of oxygen
- Anaerobes - - - No oxygen
- No ability to detoxify toxic forms of oxygen
- Aerotolerant anaerobes - - - Can grow with or without oxygen
- Limited ability to detoxify toxic forms of oxygen
- Facultative anaerobes - - - Can grow with or without oxygen, but prefers
oxygen
- Can detoxify toxic forms of oxygen
- Microaerophiles - - - Aerobes that require oxygen levels from 2 - 10%
- Limited ability to detoxify toxic forms of oxygen
- Toxic forms of oxygen initiate.... and are a by-product of.... - - Chains of
oxidation reactions
Aerobic respiration
- Four toxic forms of oxygen - - - Singlet oxygen
- Superoxide radicals
- Peroxide anion
- Hydroxyl radical
- Enzyme for (O2-) --> H2O2 - - Superoxide dismutase (SOD)
- Enzyme for H2O2 --> H2O + O2 - - Catalase and Peroxidase
- Anabolism often ceases due to insufficient ____ - - Nitrogen
- Some Gram(+/-) bacteria grow in association with plant roots to convert
nitrogen gas into ammonia - - negative
- Phosphorus is required for... - - Phospholipid membranes, DNA, RNA, ATP,
and some proteins
- Psychrophile optimal temperature range - - -5 to 20 Celsius
- Mesophile optimal temperature range - - 15 to 45 Celsius
- Thermophile optimal temperature range - - 40 to 80 Celsius
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