Physiology of Bacteria

Question 1

The study of the function of bacterial processes and reactions with respect to the bacteria themselves

Answer 1

Bacterial Physiology

Question 2

Concerns the life-supporting functions and processes of bacteria, which allow bacterial cells to grow and reproduce

Answer 2

Bacterial Physiology

Question 3

refers to the number of cells, not the size of the cells

Answer 3

Microbial growth

Question 4

Requirements for growth of a cell/bacteria

Answer 4

Physical
Chemical

Question 5

The growth and death of a bacterial population in liquid media is influenced by the following factors

Answer 5

-Moisture
-pH
-Temperature
-Amount and quantity of food
-Waste products

Question 6

What are the physical requirements in microbial growth

Answer 6

1. Temperature
2. Light
   3.Moisture
3. Acid/Alkali (ph)
4. Osmotic Pressure
5. Macro/Micro elements
6. Oxygen

Question 7

Causes bacteria to cease to row but are not killed

Answer 7

Low temperature

Question 8

Causes death of Bacteria

Answer 8

High Temperature

Question 9

3 groups wherein bacteria can be divided depending on the temperature

Answer 9

1. Psychrophilic (cold-loving)
2. Mesophilic (Moderation-loving)
3. Thermophilic(Heat-loving)

Question 10

Grows best at optimum temperature of 10°-15 °C. (water
bacteria)

Answer 10

Psychrophilic or cold-loving bacteria

Question 11

Thrives in extreme environments.

It can survive sub-zero temperatures, high pressure, low oxygen, and a nutrient-poor habitat

Answer 11

extremophile

Question 12

Prefer optimum temperature of 20°- 37°C. (pathogenic bacteria)

Answer 12

Mesophilic or Moderation-loving bacteria

Question 13

Bacteria that grow well at 50°-60°C. (soil bacteria)

Answer 13

Thermophilic or heat-loving bacteria

Question 14

Influence of Temperature on Bacterial Activity

Answer 14

1. Optimum growth temperature
2. Minimum growth temperature
3. Maximum growth temperature
4. Thermal death point
5. Thermal death time

Question 15

The temperature at which the most rapid growth and multiplication of bacteria take place. (Mesophilic bacteria: 37°C)

Answer 15

Optimum growth temperature

Question 16

The lowest temperature at which growth is possible. (Mesophilic bacteria: 15° - 20°C)

Answer 16

Minimum growth temperature

Question 17

The highest temperature at which growth is possible. (Mesophilic bacteria: 40° - 55°C)

Answer 17

Maximum growth temperature

Question 18

the lowest temperature at which microorganisms are killed by heat within a specified time, usually 10 minutes.

Answer 18

Thermal death point

Question 19

length of time required to kill all bacteria in a given substance at a stated temperature (Pasteurization of milk for 30 minutes to a temperature of 60°-65° to render it free of disease germs.)

Answer 19

Thermal death time

Question 20

• Majority of bacteria are it
• have no chlorophyll or photosynthetic pigment, and their growth is not aided by light

Answer 20

Chemosynthetic

Question 21

Kills bacteria and they are also heated and dried

Answer 21

Exposure to sun (ultraviolet light)

Question 22

Bacteria that trap the energy of sunlight in a manner similar to green plants

Answer 22

phototrophic autotrophs

Question 23

bacteria that synthesize food by the using the energy obtained from inorganic compounds

Answer 23

Chemotrophic autotrophs