Microbiology Chapter 6 Flashcards Preview

Microbiology Chapters > Microbiology Chapter 6 > Flashcards

Flashcards in Microbiology Chapter 6 Deck (31):
1

RM

Capnophiles are found in what part of the body?

A. Mouth

B. Respiratory tract

C. Blood

B. Respiratory Tract

A image thumb
2

Aerobe

An organism that requires oxygen for growth.  The organism uses oxygen as its final electron acceptor and will die in the absence of oxygen.

3

Aerotolerant Anaerobes

An anaerobic organism that can grow in the presence of oxygen, but does not use oxygen in its metabolism.  They will grow at the same rate if oxygen is present or not.

4

Autotrophs

Organisms that use carbon dioxide as their carbon source. 

5

Capnophilic

Capnophilic organisms are microaerophilic organisms that grow best in an environment with a high carbon dioxide concentration and a low oxygen concentration.  This does not mean that they are autotrophs.

6

UV radiation

Low energy radiation (nonionizing)  that damages DNA by causing the formation of pyrimidine dimers.  UV is used for disinfecting surfaces and air because it does not penetrate well.

7

Triclosan

An antiseptic in the bisphenol/biguinide group that inhbits lipid formation.  It is usually found in products that are used on the skin like lotions and soap.

8

Sterilization

The removal of all living organisms.  I does not apply to viruses.  Endospores make it particularly difficult to acheive sterilization.

9

Silver Nitrate

A member of the heavy metal group.  Silver nitrate is commonly used in dressing to treat burns.  It is an antiseptic. 

10

Sanitization

Cleaning and disinfecting at the same time.  Most disinfectants lose activity if other debris is present and do not make good sanitizing agents.  Phenol does not lose activity and is a good example of a sanitizing agent.

11

Refrigeration

The use of low temperatures as a method of preserving food or other perishable items.  Because cold does not kill this method is microbistatic.

12

Quaternary Ammonium Compounds

A group or classification of disinfectants that contain an ammonium ion (NH4+).  Because the ammonium ion has a charge, it is more effective against gram-positive organisms.

13

Pyrimidine Dimers

This is the type of mutation that UV radition causes in DNA.  A extra bond forms between adjacent pyrimidine nitrogenous bases resulting in mutation and death.

14

Proplyene Oxide

A gaseous sterilizing agent.  One of the few ways to sterilize heat-sensitive plastic items.

15

Preservation

16

AM

Salts and sugars work to preserve foods by creating a
A) Depletion of nutrients.  B) Hypotonic environment. C) Lower osmotic pressure.
D) Hypertonic environment.  E) Lower pH.

 

D: Because the solute concentration is higher the environment is described as a hypertonic environment.

17

AM

The term facultative anaerobe refers to an organism that
A) Doesn't use oxygen but tolerates it.  B) Is killed by oxygen.
C) Uses oxygen or grows without oxygen.  E) Prefers to grow without oxygen.
D) Requires less oxygen than is present in air.

 

 C: Facultative anaerobes can use oxygen for metabolism, but can also metabolize without oxygen.

18

AM

Which of the following pairs is mismatched?
A) Psychrotroph – growth at 0°C   B) Thermophile – growth at 37°C
C) Mesophile – growth at 25°C   D) Psychrophile – growth at 15°C
E) Hyperthermophiles – growth at 100°C

 

B: Thermophiles grow at temperatures much higher than 37oC.

19

RM

In which phase is bacteria easiest to kill?

A. Lag

B. Stationary

C. Log

C.Log

20


What is the order of Microbial Growth in phases?

 

 

 

 

 

                                                                     RA

Lag Phase, Log or Exponential Phase, Stationary Phase, and the Death or Decline Phase.

 

 

 

 

 

                                                                              RA

21


What is Chemostat?

 

 

 

 

 

 

                                                                   RA

It is a device used to control the growth of microbes that allows tor continuous long term growth (so they stay in the Log Phase).

 

 

 

 

                                                                                      RA

22

JP

Bacteria that prefer acidic conditions (low ph) are called?

Acidophiles

 

 

23

JP

Nutrients are absorbed by diffusion and therefore must be soluble. True or False 

True

24

AM

Salts and sugars work to preserve foods by creating a
A) Depletion of nutrients.  B) Hypotonic environment. C) Lower osmotic pressure.
D) Hypertonic environment.  E) Lower pH.

 

D: Because the solute concentration is higher the environment is described as a hypertonic environment.

25

AM

The term facultative anaerobe refers to an organism that
A) Doesn't use oxygen but tolerates it.  B) Is killed by oxygen.
C) Uses oxygen or grows without oxygen.  E) Prefers to grow without oxygen.
D) Requires less oxygen than is present in air.

 

 C: Facultative anaerobes can use oxygen for metabolism, but can also metabolize without oxygen.

26

AM

Which of the following pairs is mismatched?
A) Psychrotroph – growth at 0°C   B) Thermophile – growth at 37°C
C) Mesophile – growth at 25°C   D) Psychrophile – growth at 15°C
E) Hyperthermophiles – growth at 100°C

 

B: Thermophiles grow at temperatures much higher than 37oC.

27

RM

In which phase is bacteria easiest to kill?

A. Lag

B. Stationary

C. Log

C.Log

28


What is the order of Microbial Growth in phases?

 

 

 

 

 

                                                                     RA

Lag Phase, Log or Exponential Phase, Stationary Phase, and the Death or Decline Phase.

 

 

 

 

 

                                                                              RA

29


What is Chemostat?

 

 

 

 

 

 

                                                                   RA

It is a device used to control the growth of microbes that allows tor continuous long term growth (so they stay in the Log Phase).

 

 

 

 

                                                                                      RA

30

JP

Bacteria that prefer acidic conditions (low ph) are called?

Acidophiles

 

 

A image thumb
31

JP

Nutrients are absorbed by diffusion and therefore must be soluble. True or False 

True