Question 1

Which of the following statements best explains why viruses are not considered living organisms?

Accepted Answer

They lack cellular structure and cannot carry out metabolism on their own.

Question 2

A microbiologist isolates a microorganism that thrives in extremely acidic environments (pH \u003c 2). Which term best describes this organism?

Accepted Answer

Acidophile

Question 3

Which of the following is a key difference between Archaea and Bacteria?

Accepted Answer

Archaea have unique membrane lipids and lack peptidoglycan in their cell walls.

Question 4

Which of the following best describes the ploidy change during meiosis in eukaryotic cells?

Accepted Answer

The ploidy number is halved.

Question 5

A scientist is studying a bacterium that forms endospores and is known for causing botulism. Which genus is she most likely working with?

Accepted Answer

Clostridium

Question 6

Which of the following best describes the process of binary fission?

Accepted Answer

A single cell duplicates its DNA and splits into two identical daughter cells.

Question 7

Which of the following statements about the lytic cycle of a bacteriophage is correct?

Accepted Answer

The virus attaches, injects its genome, replicates, assembles, and lyses the host cell.

Question 8

Which of the following genome types is most similar to the host cell's genetic material in eukaryotic cells?

Accepted Answer

+ssRNA and dsDNA

Question 9

A researcher is culturing viruses in the laboratory. Which of the following methods is most appropriate for growing animal viruses?

Accepted Answer

Inoculating live animals or embryonated eggs

Question 10

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that lack nucleic acids.

Question 11

Which of the following best describes alternation of generations in algae?

Accepted Answer

A life cycle that alternates between haploid and diploid multicellular stages.

Question 12

Which of the following is a unique feature of Mycobacterium species?

Accepted Answer

They have a waxy cell wall rich in mycolic acids.

Question 13

Which of the following statements about protozoans is correct?

Accepted Answer

Protozoans are unicellular eukaryotes with diverse morphologies.

Question 14

Which of the following best describes the function of the viral envelope?

Accepted Answer

It is derived from the host cell membrane and contains proteins for host specificity.

Question 15

Which of the following statements about the lysogenic cycle is correct?

Accepted Answer

The viral genome integrates into the host genome and can remain dormant.

Question 16

Which of the following is a characteristic of cyanobacteria?

Accepted Answer

They are photosynthetic prokaryotes that produce oxygen.

Question 17

A patient is diagnosed with a disease caused by a viroid. Which of the following is true about the causative agent?

Accepted Answer

It is a small, circular RNA molecule without a protein coat.

Question 18

Which of the following best describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis is used for asexual reproduction and maintains ploidy; meiosis is used for sexual reproduction and halves ploidy.

Question 19

Which of the following is a defining feature of alveolates among protozoans?

Accepted Answer

They possess membrane-bound sacs (alveoli) beneath their plasma membrane.

Question 20

A sample contains a prokaryote that oxidizes ammonia ($$NH_3) to $$nitrite ($$NO_2$$^-$$) as part of the nitrogen cycle. To which group does this organism most likely belong?

Accepted Answer

Alphaproteobacteria (nitrifying bacteria)

Microbiology Study Guide: Prokaryotes, Eukaryotes, and Viruses (Chapters 11–13)

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