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Control of Microbial Growth

Total questions: 25

Worksheet time: 11mins

Name
Class
Date
1.

What do you mean by sterilization?

a)

Formulation of media

b)

Elimination of contamination

c)

Recovery of products

d)

Purification of products

2.

The removal or destruction of ALL forms of microbial life is called

a)

sterilization

b)

disinfection

c)

pasteurization

d)

sanitization

3.

To sterilize heat-sensitive solutions such as culture media, enzymes, and vaccines, one should use

a)

dry heat

b)

an autoclave

c)

filtration

d)

pasteurization

4.

The recommended optimum concentration of ethanol to use as a biocide is

a)

100%

b)

70%

c)

50%

d)

10%

5.

The thermal death point is the lowest temperature required to kill a liquid culture of a certain species of bacteria in 10 minutes.

a)

True

b)

False

6.

The suffix -cide means “to survive.”

a)

True

b)

False

7.

Asepsis is the absence of pathogens on an object or area.

a)

True

b)

False

8.

Antimicrobial agents that kill microorganisms would be classified as ______________.

a)

microbistatic

b)

microbicidal

9.

When all forms of microbial life have been removed or destroyed, it is ______

a)

disinfected

b)

pasteurized

c)

neutralized

d)

sterilized

10.

Milk and other beverages undergo a mild heating process to destroy a particular spoilage or disease-causing organism. this is known as

a)

sterilization

b)

degerming

c)

decontamination

d)

pasteurization

11.

Food that is dried to prevent microbial growth utilizes

a)

lyophilization.

b)

desiccation.

c)

filtration.

d)

ionizing radiation.

12.

Silver nitrate and copper sulfate are antimicrobials that denature proteins and are considered ______________.

a)

heavy metals

b)

surface-active agents.

c)

organic acids

d)

halogens

13.

What is the choice of sterilizing inoculation loop?

a)

Phenol

b)

Autoclaving

c)

Dry heat oven

d)

Direct flaming

14.

A nosocomial infection is a:

a)

Hospital acquired infection

b)

Highly contagious pathogen that requires strict transmission control conditions

c)

Minor infection

d)

An infection spread by close contact with others in the home

15.

________ is the suffix that indicates a chemical or process inhibits growth or multiplication of bacteria.

a)

-stat

b)

-cide

c)

-tion

d)

-a

16.

A pore size of _______ is often used to filter most bacteria.

a)

0.08 um

b)

0.40 um

c)

0.05 um

d)

0.22 um

17.

___________ kills vegetative bacteria within minutes, and spores within 3-10 hours.

a)

Hydrogen peroxide

b)

Glutaraldehyde

c)

Lysol

d)

Alcohol

18.

Which of the following chemicals are easily inactivated by oganic material?

a)

Phenolic compounds

b)

Chlorine compounds

c)

Chlorhexidine

d)

Benzethonium chloride

19.

Methods to physically control microbial growth include

a)

osmotic pressure

b)

phenolics

c)

soaps/surfactants

d)

heavy metals

20.

Excessive use of this chemical may cause neurological damage.

a)

phenols

b)

phenolics

c)

bisphenols

21.

It is used as surgical hand scrubs when combined with alcohol

a)

phenolics

b)

chlorine

c)

chlorhexidine

d)

iodophors

22.

It is used to preserve red color of meat and prevent groth of C. botulinum.

a)

sulfur dioxide

b)

sorbic acid

c)

sodium nitrate

d)

calcium propionate

23.

What physical method can be used to preserved food products?

a)

osmotic pressure

b)

heat

c)

high pressure

d)

filtration

24.

A pasteurization method wherein milk is exposed to 72 degree celsius for 15 seconds.

a)

classic method

b)

ultra high temperature

c)

high temperature short time

d)

all of the above

25.

Under which circumstance would one use an antiseptic?

a)

to clean your kitchen counter

b)

to prepare skin prior to giving a flu vaccine

c)

to clean the toilet when someone has vomited

d)

All of these