Question 1

Answer true or false to the reason given in the following statement: Oxidative reagents are very effective against infections of deep tissues,because they release hydroxyl radicals which kill anaerobic organisms.

Accepted Answer

The statement is true. Oxidative reagents release hydroxyl radicals that can effectively kill anaerobic organisms in deep tissues.

Question 2

Answer true or false to the reason given in the following statement: Ionizing radiation useful because it sterilizes without using heat or chemicals.

Accepted Answer

Ionizing radiation, such as gamma rays and X-rays, can be useful for sterilization as they can destroy microorganisms without the need for heat or chemicals.

Question 3

Answer true or false to the reason given in the following statement: The flash method of pasteurization is preferable because it is more effective against Staphylococcus and Streptococcus.

Accepted Answer

The flash method of pasteurization is not necessarily more effective against Staphylococcus and Streptococcus. Both the flash method and the traditional method of pasteurization have been shown to effectively reduce the number of bacteria, including Staphylococcus and Streptococcus, but the specific effectiveness may vary depending on the product and process used.

Question 4

Explain what happens when a protein becomes denatured and why this process is likely to be detrimental to microbes.Provide three examples of how proteins can be denatured.

Accepted Answer

The answer of Explain what happens when a protein becomes...

Question 5

Answer true or false to the reason given in the following statement: Hydrogen peroxide is not useful for the treatment of open wounds because the enzyme,lysozyme,which is released from damaged tissues,quickly neutralizes it.

Accepted Answer

Hydrogen peroxide is useful for the treatment of open wounds as it can help to clean the wound and kill bacteria. Although lysozyme may neutralize some of the hydrogen peroxide, this does not make it completely ineffective for wound treatment.

Question 6

Identify and describe five factors that affect the death of microbes by antimicrobial agents.

Accepted Answer

The answer of Identify and describe five factors that affect...

Question 7

Answer true or false to the reason given in the following statement: The sizes of the zones of inhibition seen with different chemicals are not comparable because bacteria move at different rates.

Accepted Answer

The sizes of the zones of inhibition depend on the effectiveness of the chemical against the bacteria and their sensitivity to it, not on bacterial motility. Therefore, the sizes of the zones of inhibition can be compared between different chemicals.

Question 8

Answer true or false to the reason given in the following statement: The environment in which the microbes to be treated exist is important,because many pathogens will be associated with organic materials such as blood and saliva.

Accepted Answer

The statement is true. The environment in which microbes exist is important as many pathogens are associated with organic materials such as blood and saliva. Proper disinfection and cleaning procedures should be followed in these situations.

Quiz 18: Control of Microbial Growth with Disinfectants and Antiseptics