18 Questions
What is the condition called when the cell membrane and cytoplasm shrink away from the cell wall?
Plasmolysis
In which type of solution would a bacterial cell likely burst if it lacks a rigid cell wall?
Hypotonic solution
What is the term for organisms that prefer to live in salty environments?
Halophilic organisms
Microbes capable of surviving in high atmospheric pressure are known as what?
Piezophiles
What happens if a bacterial cell is placed in an isotonic solution?
It will remain unchanged
If the concentration of solutes outside a cell is greater than inside, what kind of solution is it?
Hypertonic solution
Which type of microorganism prefers cold temperatures, such as deep ocean water?
Psychrophiles
What is the preferred pH range for most microorganisms in terms of growth medium?
7.0–7.4
What happens when the concentration of solutes in the external environment of a cell is greater than that inside the cell?
The cell undergoes plasmolysis
What is the preferred pH range for Acidophiles?
2 to 5
Which microorganism group prefers warm temperatures but can endure very cold or freezing temperatures?
Psychroduric organisms
What is the term for the movement of a solvent from a lower to a higher concentration of solutes through a permeable membrane?
Osmosis
What is the term for microorganisms that grow best at high temperatures?
Thermophiles
Which type of microorganism is most likely to thrive in a hypertonic solution?
Halophiles
At what temperature would a mesophile likely exhibit optimal growth?
37ºC
Which pH range is generally preferred by acidophiles for growth?
pH 3-5
How do hypertonic solutions affect microbial cells?
Cause plasmolysis by drawing water out of the cells
Which would be the best environment for alkaliphiles to grow successfully?
Basic solution with pH 10
Study Notes
- Plasmolysis occurs when bacteria with rigid cell walls are placed in a hypertonic solution, causing the cell membrane and cytoplasm to shrink away from the cell wall.
- A hypotonic solution has a lower solute concentration outside the cell compared to inside, potentially leading to plasmoptysis if a bacterial cell bursts.
- Isotonic solutions have equal solute concentrations inside and outside the cell, affecting microbial growth.
- Halophilic organisms thrive in salty environments, while haloduric organisms can survive but do not prefer salty conditions.
- Piezophiles are microbes that can survive in high atmospheric pressure environments exceeding 14.7 psi.
Explore the factors that influence microbial growth, with a focus on temperature preferences of different microbial groups such as psychrophiles, psychrotrophs, and psychroduric organisms.
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