Microbiology an Introduction: The Rate of Microbial Death Flashcards


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created 6 years ago by mmiyakooo
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1

it is easy to kill large number of populations very early on

true

2

is it difficult to kill the last remaining few organisms

true

3

why is it hard to kill the last remaining few organisms?

can divide quickly and replace population

4

how many factors affect death rate

4

5

the number of microbes is a factor that affects microbial death rate

true

6

environmental factors is a factor that affects microbial death rate

true

7

time of exposure is a factor that affects microbial death rate

true

8

the characteristic of the microbe is a factor that affects microbial death rate

true

9

what does the number of microbes as a factor mean?

larger populations take longer to kill

10

what types of environmental influences affect death rate?

temperature, containing organic material, and biofilms

11

how does temperature affect death rate?

most chemicals are more effective when heated

12

what types of organic materials inhibit the killing of microbes?

blood, vomit, feces, and urine

13

biofilms are made of

mucoid matrix

14

EPS

extracellular polymeric substances

15

mucoid matrix is made of EPS and is difficult to penetrate.

true

16

what two environmental influences inhibits the killing of microbes?

if it contains organic material or if it has a biofilm

17

what does the time of exposure as a factor mean?

longer times are more effective, especially as chemical concentrations change

18

Mycobacterium is not too waxy to be penetrated by polar chemicals

false

19

Pseudomonas are especially resistant to chemials

true

20

what are prions

infectious proteins

21

spores and cysts are inactive, resistant forms

true

22
card image

know this arrow

23

most resistant is the same as hard to kill

true

24

least resistant means the same as hard to kill

false

25

most resistant = least susceptible

true

26

least susceptible = most resistant

true

27

most susceptible = least resistant

true

28

least resistant = most susceptible

true