Which of the following is most likely to be bactericidal?
a. Membrane filtration
b. Ionizing radiation
c. Lyophilization (freeze-drying)
d. Deep-freezing
e. All of the above

Question

Which of the following is most likely to be bactericidal?

a. Membrane filtration

b. Ionizing radiation

c. Lyophilization (freeze-drying)

d. Deep-freezing

e. All of the above

Accepted Answer

Welcome everyone. Our next question says which of the following methods can preserve bacterial cells by removing water and inhibiting microbial growth. A ionizing radiation b pasteurization. See desiccation d dry heat sterilization or e all of the above. So we're talking about a method that removes water but preserves bacterial cells. So when we look at our answer choices, there's two that remove water desiccation and dry heat sterilization. But dry heat sterilization will kill bacterial cells. Well, desiccation is a method that will preserve bacterial cells by removing water. Since bacteria need water for proliferation and growth. Removal of water in the desiccation or drying out process, inhibits growth, the bacteria will stop growing, stop dividing, but they remain sort of suspended. It preserves the bacteria because you can add water back later and the bacteria will, will resume their growth. You haven't destroyed them, you've just sort of paused them in a sense. So that will preserve bacterial cells. And it does that by removing bacteria by removing water, excuse me and inhibiting microbial growth. When we look at our other answer choices, we already know it can't be all of the above because we've crossed out the dry heat sterilization since it kills bacteria by heating them to a very high temperature and then choice a ionizing radiation. And I think radiation will also kill the bacteria. It damages DNA proteins and other cellular components. So it does not preserve bacterial cells. And finally, choice B pasteurization which involves heating something to a moderate heat to reduce the microbial load in uh perishable food, particularly dairy products. So it's not aiming to preserve the bacteria. It's aiming to kill the bacteria that would cause spoilage as well as killing bacteria that could cause illness. So, not a method of preserving bacteria but of preserving perishable food. So once again, the method that can preserve bacterial cells by removing water, inhibiting microbial growth choice c desiccation. See you in the next video.

Which of the following is most likely to be bactericidal?
a. Membrane filtration
b. Ionizing radiation
c. Lyophilization (freeze-drying)
d. Deep-freezing
e. All of the above

Verified video answer for a similar problem:

Key Concepts

Bactericidal vs. Bacteriostatic Agents

Ionizing Radiation as a Microbial Control Method

Physical Methods of Microbial Control: Filtration, Freeze-Drying, and Freezing

Which of the following is most likely to be bactericidal?a. Membrane filtrationb. Ionizing radiationc. Lyophilization (freeze-drying)d. Deep-freezinge. All of the above

Verified video answer for a similar problem:

Key Concepts

Bactericidal vs. Bacteriostatic Agents

Ionizing Radiation as a Microbial Control Method

Physical Methods of Microbial Control: Filtration, Freeze-Drying, and Freezing

Which of the following is most likely to be bactericidal?
a. Membrane filtration
b. Ionizing radiation
c. Lyophilization (freeze-drying)
d. Deep-freezing
e. All of the above