Microbial Growth and Control

Question 1

What are the temperature ranges for psychrotrophs and mesophiles?

Answer 1

P: 20-30 degrees Celsius
M: 25-45 degrees Celsius

Question 2

What is one of the primary reasons why archaea are capable of withstanding higher temperatures

Answer 2

Monolayer

Question 3

Biofilm is a complex community of ___ that have formed on a surface and is encased in ___

Answer 3

Microbes

Extracellular matrix

Question 4

What is quorum sensing?

Answer 4

It is cell to cell communication in a density dependent manner in order to coordinate behavior

Question 5

For quorum sensing, when a ___ reaches a threshold level, it induces the expression of ___

Answer 5

Autoinducer

Target genes

Question 6

What is the name of the chemical agents that kill or inhibit growth of microorganisms when applied to body surfaces?

Answer 6

Antiseptics

Question 7

In order to kill or inhibit growth of microbes within a host tissue we use what?

Answer 7

Chemotherapy

Question 8

(T/F) The relationship between microbial concentration and how long it takes to kill is linear

Answer 8

Fales, not linear

Question 9

What do ice crystals do during freezing?

Answer 9

It kills the cells by disrupting the cell membrane

Question 10

What are a few methods used to control microbial growth?

Answer 10

Temperature control
Radiation
Filtration
Chemical agents

Question 11

Phenolics are commonly used as lab and hospital ___

Answer 11

Disinfectants (Lysol)

Question 12

Alcohols are bactericidal, fungicidal, but not ___-cidal

Answer 12

Sporicidal