Podcast
Questions and Answers
What type of microbe requires organic carbon for its growth?
What type of microbe requires organic carbon for its growth?
Which solution would cause a cell to shrink as water diffuses out?
Which solution would cause a cell to shrink as water diffuses out?
What is the optimum temperature range for psychrotrophs?
What is the optimum temperature range for psychrotrophs?
Which microbe type obtains energy from photosynthesis?
Which microbe type obtains energy from photosynthesis?
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What is the maximum temperature in relation to microbial growth?
What is the maximum temperature in relation to microbial growth?
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Study Notes
Carbon Source
- Heterotrophs: microbes that get carbon from organic sources
- Autotrophs: microbes that use inorganic CO₂ as their carbon source
Energy (ATP) Source
- Phototrophs: microbes that produce energy through photosynthesis
- Chemotrophs: microbes that get energy from chemical compounds
Passive Transport
- Passive transport: doesn't use energy
Solutions
- Hypotonic solution: water moves into the cell, causing it to swell. The cell wall usually prevents bursting.
- Hypertonic solution: water moves out of the cell, causing it to shrink.
Temperature for Microbial Growth
- Minimum temperature: lowest temp where microbial growth and metabolism occur
- Maximum temperature: highest temp where microbial growth and metabolism occur
- Optimum temperature: best temperature for fastest rate of growth and metabolism, below 15°C for psychrophiles.
Types of Microbes Based on Temperature Preferences
- Psychrophiles: cold-loving microbes; optimum temp below 15°C; can't grow above 20°C
- Psychrotrophs: optimum temp between 15°C and 30°C; grow in refrigerator temps and cause foodborne illness
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Description
Test your knowledge on microbial types, energy sources, and transport mechanisms. This quiz covers essential concepts regarding heterotrophs, autotrophs, and temperature preferences for microbial growth. Understand the impact of solutions on cells and the characteristics of psychrophiles.
