Question 1

Which of the following characteristics best distinguishes Alphaproteobacteria from other classes of Proteobacteria?

Accepted Answer

They often have complex life cycles involving stalks or buds and include many plant-associated bacteria.

Question 2

A patient presents with a severe gastrointestinal infection. Laboratory analysis reveals a Gram-negative, curved rod that is microaerophilic and motile. Which genus is most likely responsible?

Accepted Answer

Campylobacter

Question 3

Which of the following is a key difference between purple and green photosynthetic bacteria and cyanobacteria?

Accepted Answer

Cyanobacteria perform oxygenic photosynthesis, while purple and green bacteria perform anoxygenic photosynthesis.

Question 4

Which of the following best describes the cell wall structure of Chlamydias?

Accepted Answer

They lack peptidoglycan in their cell walls.

Question 5

Which of the following is a distinguishing feature of spirochetes?

Accepted Answer

They possess endoflagella located in the periplasmic space, allowing for corkscrew motility.

Question 6

Which of the following genera is classified as a member of the Actinobacteria?

Accepted Answer

Streptomyces

Question 7

Which of the following best describes the habitat of halophilic archaea?

Accepted Answer

Environments with high salt concentrations, such as salt lakes and salt mines.

Question 8

Which of the following is a major factor limiting our knowledge of microbial diversity?

Accepted Answer

Most microbes cannot be cultured in the laboratory.

Question 9

A bacterium is isolated from a freshwater pond. It is Gram-negative, has a stalk for attachment, and reproduces by budding. To which group does it most likely belong?

Accepted Answer

Planctomycetes

Question 10

Which of the following is a characteristic of Mycoplasmatota?

Accepted Answer

They lack a cell wall and are pleomorphic.

Question 11

Which of the following best differentiates Bacteroidetes from Fusobacteria?

Accepted Answer

Bacteroidetes are common in the human gut, while Fusobacteria are often associated with oral infections.

Question 12

Which of the following is a distinguishing feature of Deinococcota?

Accepted Answer

They are highly resistant to radiation due to efficient DNA repair mechanisms.

Question 13

Which of the following is a common feature of Betaproteobacteria?

Accepted Answer

They include important human pathogens such as Neisseria and Bordetella.

Question 14

A microbiologist is constructing a dichotomous key to differentiate Gammaproteobacteria. Which of the following genera should be included?

Accepted Answer

Pseudomonas

Question 15

Which of the following best describes the metabolic capabilities of Deltaproteobacteria?

Accepted Answer

They include bacteria that are predators of other bacteria and some that reduce sulfur compounds.

Question 16

Which of the following is a correct comparison between Planctomycetes and Chlamydias?

Accepted Answer

Planctomycetes are free-living aquatic bacteria, while Chlamydias are obligate intracellular pathogens.

Question 17

Which of the following is a habitat for methanogenic archaea?

Accepted Answer

Anaerobic environments such as swamps, marshes, and the digestive tracts of ruminants.

Question 18

Which of the following is a reason why many bacteria remain undiscovered?

Accepted Answer

They require specific growth conditions that are difficult to replicate in the laboratory.

Question 19

A researcher is comparing the photosynthetic pigments of purple bacteria and cyanobacteria. Which pigment is unique to cyanobacteria?

Accepted Answer

Chlorophyll a

Question 20

Which of the following equations best represents the oxygenic photosynthesis performed by cyanobacteria?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Microbiology Chapter 11: Bacterial and Archaeal Diversity Study Guide

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