PSI Barbering Practice Exam

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Which of the following works well as an antiseptic?

Bleach
Alcohol
Quats
UV light

The correct answer is: Alcohol

Alcohol is an effective antiseptic primarily due to its ability to denature proteins and disrupt the cell membranes of bacteria and viruses, leading to their inactivation. When used in appropriate concentrations—typically between 60% to 90%—it can effectively kill a wide range of pathogens, making it a popular choice for disinfecting skin before procedures and sanitizing surfaces. While bleach is a strong disinfectant and can kill bacteria and viruses, it is often too harsh for direct skin application and can cause irritation or damage. Quaternary ammonium compounds (quats) are effective against certain bacteria and are commonly used for surface disinfection, but they may not be as effective as alcohol against all types of pathogens. UV light can inactivate microorganisms over time, but it's used in specific contexts, such as sterilizing surfaces and air, rather than as a direct skin antiseptic. Thus, alcohol stands out as the most effective antiseptic for direct application in personal care settings.