15 Questions
Stress adaptation allows bacterial cells to grow faster in changed conditions.
False
Sub-lethal injury causes a permanent physiological change in bacterial cells.
False
Lethal stress always causes the death of all bacterial cells in the population.
False
Stress adaptation enables bacterial cells to resist subsequent exposure to harsher treatment.
True
Experiencing lethality by a fraction of the bacterial population may lead to improved survival of the overall population.
True
Stress adaptation enables bacterial cells to resist subsequent exposure to harsher treatment.
True
Experiencing lethality by a fraction of the bacterial population may lead to improved survival of the overall population.
True
Sub-lethal injury causes a permanent physiological change in bacterial cells.
False
Bacterial cells adapt completely to the changed conditions, and growth rate is not affected.
True
A brief exposure to a suboptimal environment triggers cellular mechanisms that enable bacterial cells to resist subsequent exposure to harsher treatment.
True
What is the main cause of staphylococcal food poisoning?
Exposure to staphylococcal toxins already present in contaminated food
Why is staphylococcal food poisoning considered as 'intoxication'?
Because it is caused by consuming toxins already present in the contaminated food
What distinguishes staphylococcal toxin from other toxins in terms of its resistance to heat?
It remains active even after heating or canning
Which compound excreted by S. aureus is considered a virulence factor?
Staphylococcal enterotoxins
In 1914, how was the link between staphylococci and foodborne illness established?
By drinking contaminated milk
Study Notes
Stress Adaptation in Bacterial Cells
- Stress adaptation enables bacterial cells to grow faster in changed conditions and resist subsequent exposure to harsher treatment.
- Sub-lethal injury causes a permanent physiological change in bacterial cells, allowing them to adapt to new conditions.
- Experiencing lethality by a fraction of the bacterial population may lead to improved survival of the overall population.
- Brief exposure to a suboptimal environment triggers cellular mechanisms that enable bacterial cells to resist subsequent exposure to harsher treatment.
Staphylococcal Food Poisoning
- The main cause of staphylococcal food poisoning is the ingestion of enterotoxins produced by Staphylococcus aureus.
- Staphylococcal food poisoning is considered an 'intoxication' because it is caused by the ingestion of pre-formed toxins.
- Staphylococcal toxin is resistant to heat, distinguishing it from other toxins.
- The compound excreted by S. aureus considered a virulence factor is alpha-toxin.
- The link between staphylococci and foodborne illness was established in 1914.
Explore the concept of microbial stress response in food environments and the degrees of bacterial injury. Learn about stress adaptation, sub-lethal injury, and lethal stress, and their impact on bacterial cells.
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