#1: Growth Curve

Which growth phase?

Cells are producing enzymes to better exploit available resources
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Terms in this set (21)
Which growth phase?

Cells are producing enzymes to better exploit available resources
Lag phase
Which growth phase?

Cells are dividing at the maximal rate
Exponential phase
Which growth phase?

Waste products have accumulated to toxic levels
Death Phase
Which growth phase?

Waste products have accumulated to inhibitory levels
Stationary Phase
In which case would the shortest lag period most likely occur?

A. Transfer to a different temperature B. Transfer to a different pH
C. Transfer to a different salt concentration
D. Transfer from old complex medium to minimal medium
E: Transfer from old complex medium to fresh complex medium
Transfer from old complex medium to fresh complex medium
How does incubating the culture with shaking influence growth of the bacteria?

A. Shaking improves overall aeration, increasing oxygen content in the media.
B. Shaking distributes the cells evenly throughout the media, preventing contact inhibition.
C. Shaking evenly distributes waste by-products, preventing them from accumulating in toxic concentrations.
D. Shaking evenly distributes nutrients, giving the bacteria better access to resources.
``Shaking improves overall aeration, increasing oxygen content in the media.
Growth Temperature Classifications

Optimal growth at ~35°C
Mesophile
Growth Temperature Classifications

Optimal growth at ~65°C
Thermophile
Growth Temperature Classifications

Most likely Archaea, not Bacteria
Hyperthermophile
Growth Temperature Classifications

The pathogens that infect you
Mesophile
Growth Temperature Classifications The colorful bacteria that live in hot springsThermophilepH Growth Classifications Optimal pH is ~9.5AlkaliphilepH Growth Classifications Optimal pH is ~3.5AcidophilepH Growth Classifications Bacteria that live in Greek yogurtAcidophilepH Growth Classifications Bacteria that live in your colonNeutrophileGrowth in Oxygen Classifications Bacteria that only grow at the top of a broth culture tubeObligate AerobeGrowth in Oxygen Classifications Bacteria grow evenly throughout a tube of broth culture, but more at the top then the bottomFaculatative AnaerobeGrowth in Oxygen Classifications Bacteria that only grow at the bottom of a broth culture tubeObligate Anaerobe:Growth in Oxygen Classifications Grow solely by fermentation but are able to tolerate oxygenFaculatative AnaerobeGrowth in Oxygen Classifications Only grows in the presence of oxygenObligate AerobeGrowth in Oxygen Classifications Bacteria that can do both anaerobic fermentation and oxidative respirationFaculatative Aerobe