BMOL6401 - L5 - Microbial Environment Requirements

What does physiochemical parameters mean?

• Factors affecting the environment
• Physical and chemical factors
• Only temperature and pH
• Only chemical properties
• Water availability

What is a psychrophile?

• Cold-loving organism
• Heat-resistant organism
• Salt-resistant organism
• High-pressure organism
• Acid-resistant organism

What is a thermophile?

• Cold-loving organism
• Heat-loving organism
• Salt-loving organism
• Acid-loving organism
• Pressure-loving organism

What is a halophile?

• Cold-loving organism
• Heat-loving organism
• Salt-loving organism
• Acid-loving organism
• Pressure-loving organism

Which of these is a non-negotiable need for life?

• Oxygen
• Nitrogen
• Salt
• Water
• Carbon dioxide

Define extremophiles

• Organisms that thrive in moderate conditions
• Organisms that thrive in extreme conditions
• Organisms that die in extreme conditions
• Organisms with a short lifespan
• Organisms with high adaptability

As temperature increases, gas solubility…

• Increases
• Decreases
• Stays the same
• Fluctuates
• None of the above

How can you prevent ice crystals forming in cells at low temperatures?

• Add salt
• Add glycerol
• Increase pressure
• Add antifreeze chemicals
• Heat the cells

Define cardinal temperatures

• Temperatures where no growth occurs
• The temperature at which the organism grows best
• The maximum temperature organisms can tolerate
• The minimum, optimum, and maximum temperatures organisms grow
• The minimum temperature only

Define psychrophiles

• Cold-loving organisms
• Heat-loving organisms
• Salt-loving organisms
• Acid-loving organisms
• Pressure-loving organisms