Question 1

Which of the following is NOT a characteristic of myxobacteria?

Accepted Answer

Myxobacteria are commonly found in soil or dead organic matter on nutrient-poor agar, not nutrient-rich agar.

Question 2

Currently, well over________ phyla of Bacteria have been identified from________ sequencing.

Accepted Answer

The answer of Currently, well over________ phyla of Bacteria have...

Question 3

Which of the following traits is NOT characteristic of Caulobacter?

Accepted Answer

Caulobacter are typically found in oligotrophic, or low-nutrient, aquatic environments, rather than habitats rich in nutrients.

Question 4

A culture of nitrogen- fixing, free- living bacteria is composed of large gram- negative rods that form resting structures called cysts, and is usually found in nature in neutral and alkaline soils. Its genus name is

Accepted Answer

The description of the bacteria matches that of Azotobacter. Derxia and Azomonas are not commonly associated with nitrogen-fixation, while Azospirillum is commonly found in acidic soils.

Question 5

Which of the following gliding bacteria form(s) fruiting bodies?

Accepted Answer

Only Myxococcus has the ability to form fruiting bodies. Cytophaga and Beggiatoa do not have this feature.

Question 6

Azospirillum lipoferum is a terrestrial nitrogen- fixing bacterium that often forms a(n)________relationship with ________.

Accepted Answer

The answer of Azospirillum lipoferum is a terrestrial nitrogen- fixing...

Question 7

Type I methanotrophs

Accepted Answer

Type I methanotrophs possess bundles of disc-shaped vesicles in internal membranes, are obligate aerobes, and use the ribulose monophosphate cycle for carbon assimilation.

Question 8

Which grouping is gram- negative bacillus- shaped, faculatively anaerobic, and commonly found in the intestines of animals?

Accepted Answer

The answer of Which grouping is gram- negative bacillus- shaped,...

Question 9

Two broad ecological classes of sulfur- oxidizing bacteria exist: those living at _________ and those living at________ .

Accepted Answer

The answer of Two broad ecological classes of sulfur- oxidizing...

Question 10

Scientists studying bioremediation often use environmental strains of ________ that is capable of breaking down pesticides and other toxic chemicals.

Accepted Answer

Pseudomonas is a well-known genus of bacteria that is commonly used in bioremediation due to its ability to break down a wide range of toxic chemicals, including pesticides. Bacillus and Clostridium are also commonly used in bioremediation, but they are more commonly associated with breaking down organic matter rather than specifically targeting toxic chemicals. Staphylococcus is generally not used in bioremediation.

Question 11

Sheathed bacteria are commonly isolated from

Accepted Answer

Sheathed bacteria are commonly found in freshwater habitats rich in organic matter, where they can attach to surfaces and form biofilms.

Question 12

Which of the following bacteria is the least phylogenetically related to Desulfovibrio?

Accepted Answer

The answer of Which of the following bacteria is the...

Question 13

Which of the following is NOT correct regarding ammonia oxidation by nitrifying bacteria?

Accepted Answer

The answer of Which of the following is NOT correct...

Question 14

Which of the following organisms does NOT produce prosthecae?

Accepted Answer

Leptothrix does not produce prosthecae; it is known for forming sheaths around its cells, unlike the other organisms listed which do produce prosthecae.

Question 15

________is the term used to identify salt- loving bacteria.

Accepted Answer

The answer of ________is the term used to identify salt-...

Question 16

Experiments with Azotobacter chroococcum have led to the observation that

Accepted Answer

The answer of Experiments with Azotobacter chroococcum have led to...

Question 17

What is a major distinction between the hydrogen chemolithotrophs and many sulfur chemolithotrophs and the nitrifying bacteria?

Accepted Answer

The major distinction between hydrogen chemolithotrophs and many sulfur chemolithotrophs and the nitrifying bacteria is that hydrogen chemolithotrophs are almost all facultative chemolithotrophs, whereas the sulfur chemolithotrophs and nitrifying bacteria are nearly all obligate chemolithotrophs. This means that hydrogen chemolithotrophs can also use organic compounds as a source of energy, while sulfur chemolithotrophs and nitrifying bacteria can only survive and grow by using inorganic compounds as a source of energy.

Question 18

Campylobacter and Helicobacter are two genera within the________ class of Proteobacteria.

Accepted Answer

Campylobacter and Helicobacter are both genera within the epsilon subdivision of Proteobacteria.

Question 19

Pseudomonas aeruginosa is naturally resistant to many of the widely used antibiotics due to the presence of a(n)________ .

Accepted Answer

The answer of Pseudomonas aeruginosa is naturally resistant to many...

Question 20

The structures often present in cells of obligate chemolithotrophs and which contain high levels of Calvin cycle enzymes (such as RuBisCO) are known as

Accepted Answer

Carboxysomes are structures found in obligate chemolithotrophs that contain high levels of enzymes involved in the Calvin cycle, such as RuBisCO. They are thought to play a role in concentrating CO2 for use in carbon fixation. Lysosomes are membrane-bound organelles involved in intracellular digestion, inclusion bodies are aggregates of proteins or other macromolecules, and peroxisomes are involved in lipid metabolism and oxidative stress responses.

Quiz 17: Bacteria: the Proteobacteria