Exam 1 Microbial Growth

Question 1

Increase in the size of a population of microbes

Answer 1

Growth

Question 2

Grow from light and carbon dioxide

Answer 2

Photoautotrophs

Question 3

Grow from chemical compounds and carbon dioxide

Answer 3

Chemoautotrophs

Question 4

Grow from light and organic compounds

Answer 4

Photoheterotrophs

Question 5

Grow from chemical compounds and organic compounds

Answer 5

Chemoheterotrophs

Question 6

What are the 7 growth requirements?

Answer 6

Oxygen
Temp
pH
Moisture
Osmotic pressure
Light
Food

Question 7

Require oxygen for growth

Answer 7

Strict aerobes

Question 8

Require a total absence of oxygen

Answer 8

Strict anaerobes

Question 9

Grow in the absence or presence of oxygen

Answer 9

Facultative organisms

Question 10

Do not use oxygen, but can tolerate oxygen

Answer 10

Aerotolerant anaerobes

Question 11

Require very little free oxygen to maintain growth

Answer 11

Microaerophillic organisms

Question 12

What is the most important factor affecting the growth of microorganisms?

Answer 12

Temperature

Question 13

Prefer cold temps

Answer 13

Psychrophilic

Question 14

Prefer moderate temps (most pathogens are this)

Answer 14

Mesophilic

Question 15

Prefer high temps

Answer 15

Hyper Thermophilic

Question 16

This media contains substances that favor or inhibit the growth of particular organisms

Answer 16

Selective media

Question 17

Give an example of selective media

Answer 17

Sabouraud dextrose agar (inhibits bac and selects for fungus)

Question 18

Presence of visible changes in medium or differences in the appearance of colonies help differentiate organisms

Answer 18

Differential media

Question 19

Give an example of differential medium

Answer 19

Blood agar

Question 20

Give an example of agar that is both selective and differential

Answer 20

MacConkey agar

Question 21

How do we preserve cultures?

Answer 21

Refrigeration
Deep-freezing
Lyophilization