Micro Biology 1 Flashcards
What are 3 types of bacteria
Round
Rod
Spiral
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Pneumonia, Tetanus, Syphilis
How does Bacteria reproduce?
Through Binary Fission
What is Step 1 of Bacteria reproduction?
DNA replicates
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There are 2 identical strands of DNA
What is Step 2 of Bacteria reproduction?
The cell elongates with a DNA strand going to each end
What is Step 3 of Bacteria reproduction?
The cell splits into two similar cells
How can bacteria withstand harsh conditions
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Lack of food, high temp. etc
By producing an endospore
During binary fission, what does bacteria produce?
A tough walled endoscope to enclose the new strand of DNA
What does the endospore do when conditions become suitable?
The endospore absorbs water. The tough wall breaks down and the bacteria can continue to reproduce again
What happens during the Lag phase when bacteria reproduces
Population of bacteria remains low
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They are adapting to their new environment
What happens during the Log phase when bacteria reproduces
Bacteria numbers are increasingly rapidly
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Conditions are ideal
What happens during the stationary phase when bacteria reproduces
Bacteria numbers remain steady
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Birth rate = Death rate
Why does the bacteria population not increase further after the stationary phase
Lack of:
Food
space
oxygen
moisture
What is the decline phase?
Due to unsuitable conditions bacteria numbers decrease
What is the death phase
All bacteria can die or a small number may survive by producing endospores
What is mutation?
The change in the amount or structure of DNA
How do bacteria evolve very fast?
Due to the speed at which new mutations can spread
What is it called when bacteria evolve very fast in response to the antibiotics
Antiobiotic resistance
