Bacterial Growth Flashcards
_____ _____ division of one piece of bacteria into two daughter cells in a process process called _____ _____
Bacterial growth, binary fission
The bacterial population undergoes _____ _____ if the number surviving exceeds unity on average
Exponential growth
Period when the bacteria adapts themselves to growth conditions
Lag phase
Period when the individual bacteria are maturing and not yet able to divide
Lag phase
Period when the synthesis of RNA, enzymes, and other molecules occur
Lag phase
Period when the cells are duplicating at a constant rate and are metabolically active
Log phase
Period when the generation time of a culture can be determined
Log phase
Period when the growth rate and death rate are equal
Stationary phase
Period when the number
of new cells created is limited by the growth factor
and as a result the rate of cell growth matches the
rate of cell death
Stationary phase
What are the two growth-limiting factors of bacterial growth?
- Depletion nutrients
2. Formation of inhibitory products
Period when bacteria run out of nutrients and die
Death phase
Growth of bacteria on a solid agar
Colony formation
What are the four factors needed for bacterial growth?
pH, temperature, moisture or water, oxygen
Most bacteria grow within what range of pH
5.4 to 8.5
Used to maintain proper bacterial growth pH environment
Buffers
Most bacteria grow within what temperature range
35 to 37 degree centigrade
Bacteria that have growth temperature at 24 to 40 degree centigrade
Mesophiles
Can survive in a dry environment in a dormant state
Spores
Microorganisms that need oxygen to survive
Obligate aerobes
Microorganisms that donot need oxygen to survive
Obligate anaerobes
Microorganisms that carry aerobic metabolism when oxygen is present but shift to anaerobic metabolism in the absence of oxygen
Facultative anaerobes
T/F: Bacteria cannot survive in extreme habitats
False
Microorganisms that prefer oxygen concentration between that of obligate aerobes and anaerobes
Microaerophiles
Microorganisms that prefer concentrations of carbon dioxide closer to that found in animals rather than that found in the atmosphere
Capneic
