14 Questions
Affect permeability of the microbe cell membrane
Phenols
Should only be used as disinfectant
Both A and B
Effective against gram -positive and negative bacteria, fungi, and viruses
All of the above
Can be used as both disinfectants and antiseptics
Both A and B
Halogens used as antiseptics
Iodides
Halogens used as disinfectants
Chlorines
Dissolve lipids in the cell wall and membrane
QUATS
Affect the protein structure of microbes
Aldehydes
Destroys DNA and microbial proteins
Ethylene oxide
Dissolve membrane lipids and coagulate microbial proteins
Alcohols
Interfere with proteins and enzymes of the microbes
Halogens
Denature microbial proteins
Biguanides
Works best against anaerobic bacteria, can be used as either a disinfectant or an antiseptic
Hydrogen Peroxide
Disinfectants
Biguanides = Chlorhexidine Halogens = Chlorine, iodide Phenols = Chloraxylenol, cresol, hexachlorophene, pine sol QUATS = Benzalkonium chloride
Study Notes
Halogens as Disinfectants and Antiseptics
- Halogens are effective against a wide range of microorganisms, including gram-positive and negative bacteria, fungi, and viruses.
- They can be used as both disinfectants and antiseptics, depending on the context.
Mechanism of Action
- Halogens affect the permeability of the microbe cell membrane.
- They dissolve lipids in the cell wall and membrane, disrupting the structural integrity of the microbe.
- Halogens also denature microbial proteins, interfering with their function and ultimately leading to the destruction of the microbe.
- Additionally, they can destroy DNA and microbial proteins, further contributing to their antimicrobial effects.
Uses of Halogens
- Halogens can be used as disinfectants, effective against a broad range of microorganisms.
- They can also be used as antiseptics, with some halogens being more effective in this context than others.
- Specifically, halogens work well against anaerobic bacteria, and can be used as either a disinfectant or an antiseptic in these cases.
This quiz covers the factors that affect the permeability of a microbe's cell membrane. Understand how different factors can impact the movement of molecules in and out of the cell. Test your knowledge of microbiology and cellular biology!
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