Chapter 4

Question 1

Pop. A benefitted, Pop B. benefitted

Answer 1

Mutalism

Question 2

Pop. A harmed, Pop B. unaffected

Answer 2

Amensalism

Question 3

Pop. A benefitted, pop B unaffected

Answer 3

commensalism

Question 4

Pop A. unaffected, Pop. B unaffected

Answer 4

Neutralism

Question 5

An all aquatic phylum of Archaea

Answer 5

Crenarchaeota

Question 6

Rhodospirillum, a genus capable of fixing nitrogen, is a type of?

Answer 6

purple nonsulfur bacteria

Question 7

all the microbes of a single species living in a particular area is an example of a?

Answer 7

population

Question 8

Which symbiotic relationship type best describes the relationship between pathogenic bacteria and humans?

Answer 8

parasitism

Question 9

Treponema pallidum, the causative agent of syphilis, is an example of which group of organisms?

Answer 9

spirochetes

Question 10

What bacterial group is thought to be most closely related to the last universal common ancestor?

Answer 10

Acetothermus

Question 11

Methanobrevibacter oralis is an example of which type of organism?

Answer 11

an archaean that takes advantage of the conditions caused by periodontal disease to grow; may or may not affect disease progression

Question 12

Microbial ecology is defined as the study of?

Answer 12

interactions between microbial populations and their environment

Question 13

Approximately what percentage of prokaryotes are thought to be pathogens?

Answer 13

less than 1%

Question 14

Which genus contains the nitrogen-fixing bacteria that live in legume nodules?

Answer 14

Rhizobium

Question 15

Which genus, believed to be the deepest-branching archaeal genus, has flagella and is strictly anaerobic?

Answer 15

Thermoproteus

Question 16

Which of the following correctly describes the metabolism of methanogens?

Answer 16

They produce CH4

Question 17

Vibrio cannot be classified as either gram positive or gram negative on the basis of?

Answer 17

the Gram staining protocol

Question 18

Escherichia coli provides what vitamin for humans

Answer 18

Vitamin K

Question 19

The classifications gram-positive and gram-negative reference?

Answer 19

staining patterns, which depend on cell well properties

Question 20

oligotrophs are defined as

Answer 20

organisms capable of living in low-nutrient environments such as deep oceanic sediments, glacial ice, or deep undersurface soil