Question 1

What are signs of improperly canned foods that indicate spoilage and that they should NOT be consumed? (Select all that apply)

Accepted Answer

Bubbles, cloudiness, and bulging cans are signs of spoilage due to gas production and microbial activity, indicating that the food should not be consumed. Crinkled cans are not typically associated with spoilage.

Question 2

Which endospore-forming bacterium can cause even properly canned food to spoil when it is stored under hot conditions?

Accepted Answer

Bacillus stearothermophilus is known for its ability to spoil canned food under hot conditions due to its thermophilic nature, meaning it can thrive at higher temperatures compared to other bacteria.

Question 3

Although autoclaves are used in laboratories to kill microorganisms and sterilize equipment, they are relatively ineffective in circumstances such as sterilization of ______________. (Select all that apply)

Accepted Answer

The answer of Although autoclaves are used in laboratories to...

Question 4

The microbial control method best suited to sterilizing an indwelling medical device such as a catheter is ___________.

Accepted Answer

Ionizing radiation is best suited for sterilizing indwelling medical devices such as catheters because it can penetrate deep into objects, effectively killing all microorganisms without the need for high temperatures or chemicals that could damage the device.

Question 5

The microbial control method best suited to sterilizing surfaces in an operating room is ___________.

Accepted Answer

UV radiation is effective for sterilizing surfaces as it can kill or inactivate microorganisms by damaging their DNA, making it suitable for operating room surfaces.

Question 6

The microbial control method best suited to sterilizing medication for IV delivery is ___________.

Accepted Answer

Filtration is the best method for sterilizing medications for IV delivery because it can remove microorganisms without altering the chemical composition of the medication, which is crucial for maintaining the medication's efficacy and safety. Other methods like autoclaving and radiation could potentially degrade the medication.

Question 7

The microbial control method best suited to sterilizing reusable medical and dental instruments is ___________.

Accepted Answer

An autoclave uses pressurized steam to kill all forms of microorganisms, including spores, making it the best method for sterilizing reusable medical and dental instruments.

Question 8

UV radiation is an effective method of disinfecting surfaces because it ____________.

Accepted Answer

UV radiation causes the formation of thymine dimers in microbial DNA, which blocks replication and thus is an effective method of disinfection.

Quiz 24: Environmental and Industrial Microbiology