Question 1

Which domain includes organisms with branched hydrocarbon chains in their cell membrane lipids and lacks true peptidoglycan in their cell walls?

Accepted Answer

Domain Archaea

Question 2

Organisms like Clostridium perfringens belong to which phylum?

Accepted Answer

Phylum Firmicutes

Question 3

Which property distinguishes Gram-positive bacteria from Gram-negative bacteria?

Accepted Answer

High concentration of peptidoglycan and presence of teichoic acids

Question 4

Which equation best represents the process carried out by methanogenic archaea?

Accepted Answer

$$\mathrm{CO_2$ + 4H_2 \rightarrow CH_4$ + 2H_2O}$$

Question 5

Which class of Proteobacteria is known for nitrogen fixation associated with plant roots?

Accepted Answer

Alphaproteobacteria

Question 6

Which bacterial genus is known for its resistance to radiation and has an outer membrane similar to Gram-negatives but stains Gram-positive?

Accepted Answer

Deinococcus

Question 7

Which phylum includes organisms that are obligate anaerobes, rod-shaped, and capable of forming endospores?

Accepted Answer

Phylum Firmicutes (Class Clostridia)

Question 8

Which type of reproduction is most common among prokaryotes?

Accepted Answer

Asexual reproduction via binary fission

Question 9

Which group of fungi produces ascospores within a sac-like structure called an ascus?

Accepted Answer

Division Ascomycota

Question 10

Which property is used to distinguish between crustose, foliose, and fruticose lichens?

Accepted Answer

Growth form and thallus morphology

Question 11

Which equation describes the conversion of ammonia to nitrate by nitrifying bacteria?

Accepted Answer

$$\mathrm{NH_3$ + 2O_2 \rightarrow NO_3$^- + 2H^+ + H_2O}$$

Question 12

Which protozoan group is defined by the presence of cilia and binucleate cells?

Accepted Answer

Ciliates

Question 13

Which property is characteristic of Mycoplasma species?

Accepted Answer

Absence of a cell wall and pleomorphic shape

Question 14

Which group of parasites includes organisms with a scolex and proglottids, lacking a digestive tract?

Accepted Answer

Cestodes (tapeworms)

Question 15

Which property is used to classify bacteria as deeply branching?

Accepted Answer

Living in extreme environments similar to early Earth

Question 16

Which equation represents the glycolytic pathway used by facultative anaerobic gammaproteobacteria?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ \rightarrow 2C_3H_4O_3 + 2ATP}$$

Question 17

Which property is characteristic of pathogenic spirochetes?

Accepted Answer

Helical shape and corkscrew motility

Question 18

Which group of fungi is classified by the production of basidiospores on a basidium?

Accepted Answer

Division Basidiomycota

Question 19

Which property is used to distinguish between septate and coenocytic hyphae in fungi?

Accepted Answer

Presence or absence of cell wall separation within hyphae

Question 20

Which group of arthropods is most important as vectors for bacterial, viral, and protozoan diseases?

Accepted Answer

Class Arachnida (ticks and mites)

Microbial Classification: Taxonomy and Morphology of Prokaryotes, Eukaryotes, and Fungi

Study Guide - Practice Questions