Question 1

You have isolated a bacterium that grows in a medium containing only inorganic nutrients. Ammonia is oxidized to a nitrate ion. This bacterium is
A) gram-negative.
B) using anaerobic respiration.
C) a chemoautotroph.
D) a photoheterotroph.
E) a photoautotroph.

Accepted Answer

The bacterium is a chemoautotroph because it obtains energy by oxidizing inorganic substances (ammonia to nitrate) and uses carbon dioxide as a carbon source.

Question 2

Figure 11.1  What is group ʺc.ʺ in the key shown in Figure 11.1?
A) spirochaetes
B) planctomycetes
C) chlamydiae
D) fusobacteria
E) bacteroidetes

Accepted Answer

A

Question 3

Which of the following bacteria is gram-positive?
A) Bacteroides
B) Rickettsia
C) Salmonella
D) Streptococcus
E) Pseudomonas

Accepted Answer

Streptococcus is a genus of gram-positive bacteria, characterized by their spherical shape and tendency to form chains.

Question 4

Which of the following genera is an anaerobic gram-negative rod?
A) Escherichia
B) Treponema
C) Neisseria
D) Staphylococcus
E) Bacteroides

Accepted Answer

Bacteroides is an anaerobic gram-negative rod, commonly found in the intestines of humans and animals.

Question 5

You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. You can be sure that this bacterium is
A) a chemoautotroph.
B) a photoheterotroph.
C) a photoautotroph.
D) gram-positive.
E) using anaerobic respiration.

Accepted Answer

The bacterium is using anaerobic respiration because it reduces nitrate to nitrogen gas in the absence of oxygen, which is a characteristic of anaerobic respiration.

Question 6

Which of the following are found primarily in the intestines of humans?
A) facultatively anaerobic gram-negative rods
B) gram-negative aerobic rods and cocci
C) endospore-forming rods
D) gram-positive cocci
E) aerobic, helical bacteria

Accepted Answer

Facultatively anaerobic gram-negative rods, such as Escherichia coli, are commonly found in the human intestines.

Question 7

Which of the following form conidiospores?
A) endospore-forming gram-positive rods and cocci
B) rickettsias
C) anaerobic gram-negative cocci
D) actinomycetes and related organisms
E) spiral and curved bacteria

Accepted Answer

Actinomycetes and related organisms form conidiospores, which are a type of asexual spore commonly found in fungi and some bacteria like actinomycetes.

Question 8

Staphylococcus and Streptococcus can be easily differentiated in a laboratory by which one of the following?
A) glucose fermentation
B) growth in high salt concentrations
C) ability to cause disease
D) cell shape
E) Gram stain reaction

Accepted Answer

Staphylococcus can grow in high salt concentrations, such as in Mannitol Salt Agar, whereas Streptococcus cannot.

Question 9

Which one of the following bacteria does NOT belong with the others?
A) Bacillus
B) Staphylococcus
C) Streptococcus
D) Escherichia
E) Lactobacillus

Accepted Answer

Escherichia is a Gram-negative bacterium, while the others are Gram-positive.

Question 10

Which of the following lacks a cell wall?
A) Clostridium
B) Mycobacterium
C) Borrelia
D) Mycoplasma
E) Nocardia

Accepted Answer

Mycoplasma lacks a cell wall.

Question 11

Which of the following bacteria is gram-negative?
A) Bacillus
B) Mycobacterium
C) Treponema
D) Corynebacterium
E) Staphylococcus

Accepted Answer

Treponema is a genus of spiral-shaped bacteria that are gram-negative.

Question 12

Which of the following do you expect to be MOST resistant to high temperatures?
A) Bacillus subtilis
B) Eschericia coli
C) Neisseria gonorrhoeae
D) Streptococcocus pyogenes
E) Staphylococcus aureus

Accepted Answer

Bacillus subtilis forms endospores, which are highly resistant to extreme conditions, including high temperatures.

Question 13

Which of the following is NOT an enteric?
A) Salmonella
B) Campylobacter
C) Shigella
D) Enterobacter
E) Escherichia

Accepted Answer

Campylobacter is not classified as an enteric bacterium; it is primarily associated with causing gastrointestinal infections but is not part of the Enterobacteriaceae family, which includes the other options.

Question 14

Which of the following is NOT a characteristic inherent of the non-endospore-forming gram-positive rods?
A) nonpathogenic
B) carry out fermentative metabolism
C) display a branched filamentous morphology
D) are aerotolerant
E) lack cell walls

Accepted Answer

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

Question 15

Which of the following is NOT a characteristic of spirochetes?
A) found in the human oral cavity
B) easily observed with brightfield microscopy
C) possess an axial filament
D) helical shape
E) gram-negative

Accepted Answer

Spirochetes are not easily observed with brightfield microscopy due to their thin and spiral shape; they are better visualized using darkfield microscopy or special staining techniques.

Question 16

Which of the following is NOT a characteristic of Neisseria?
A) Some species are human pathogens.
B) cocci
C) gram-negative
D) oxidase-positive
E) requires X and V factors

Accepted Answer

Neisseria species do not require X and V factors for growth; this is a characteristic of Haemophilus species.

Question 17

Escherichia coli belongs to the
A) green sulfur bacteria.
B) spirochetes.
C) actinomycetes.
D) gram-positive bacteria.
E) proteobacteria.

Accepted Answer

Escherichia coli is a member of the proteobacteria, which is a major phylum of gram-negative bacteria.

Question 18

Rickettsias differ from chlamydias in that rickettsias
A) are enterics.
B) are gram-negative.
C) are intracellular parasites.
D) form elementary bodies.
E) require an arthropod for transmission.

Accepted Answer

Rickettsias require an arthropod vector for transmission, such as ticks, lice, or fleas, which is a key difference from chlamydias.

Question 19

Requirements for X and V factors are used to identify
A) Haemophilus.
B) Pseudomonas.
C) Escherichia.
D) Staphylococcus.
E) Neisseria.

Accepted Answer

Haemophilus species require X (hemin) and V (NAD) factors for growth, which is a key characteristic used for their identification.

Question 20

Which of the following pairs is mismatched? A) dissimilatory sulfate-reducing bacteria  produce H₂S B) Cytophaga  a gliding, nonfruiting bacterium C) actinomycetes  reproduce by fragmentation D) chemoautotrophic bacteria  fix atmospheric nitrogen E) archaea  extremophiles

Accepted Answer

Chemoautotrophic bacteria obtain energy by oxidizing inorganic substances and use carbon dioxide as a carbon source, but they do not fix atmospheric nitrogen. Nitrogen fixation is typically associated with certain bacteria and archaea, not specifically chemoautotrophs.

Quiz 11: The Prokaryotes: Domains Bacteria and Archaea

You have isolated a bacterium that grows in a medium containing only inorganic nutrients. Ammonia is oxidized to a nitrate ion. This bacterium is

Figure 11.1 What is group ʺc.ʺ in the key shown in Figure 11.1?

Which of the following bacteria is gram-positive?

Which of the following genera is an anaerobic gram-negative rod?

You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. You can be sure that this bacterium is

Which of the following are found primarily in the intestines of humans?

Which of the following form conidiospores?

Staphylococcus and Streptococcus can be easily differentiated in a laboratory by which one of the following?

Which one of the following bacteria does NOT belong with the others?

Which of the following lacks a cell wall?

Which of the following bacteria is gram-negative?

Which of the following do you expect to be MOST resistant to high temperatures?

Which of the following is NOT an enteric?

Which of the following is NOT a characteristic inherent of the non-endospore-forming gram-positive rods?

Which of the following is NOT a characteristic of spirochetes?

Which of the following is NOT a characteristic of Neisseria?

Escherichia coli belongs to the

Rickettsias differ from chlamydias in that rickettsias

Requirements for X and V factors are used to identify

Which of the following pairs is mismatched?