Question 1

Which of the following statements best describes the theory of biogenesis as it relates to the historical debate over spontaneous generation?

Accepted Answer

Biogenesis asserts that living organisms arise only from preexisting living cells.

Question 2

A patient presents with a fungal infection that is resistant to most antifungal drugs. Which unique feature of fungal cells contributes to this resistance?

Accepted Answer

Presence of ergosterol in the plasma membrane

Question 3

Which of the following best explains why viruses are not classified as living organisms?

Accepted Answer

Viruses cannot reproduce independently outside of a host cell.

Question 4

A microbiologist is classifying a newly discovered microorganism. It is unicellular, lacks a nucleus, and has a cell wall containing peptidoglycan. To which group does this organism most likely belong?

Accepted Answer

Bacteria

Question 5

Which of the following equations correctly represents the process of binary fission in bacteria, where $$N is $$the final number of cells, $$N_0 is $$the initial number of cells, and $$n is $$the number of generations?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 6

A patient is diagnosed with malaria, a disease caused by a protozoan. Which of the following characteristics distinguishes protozoa from bacteria?

Accepted Answer

Protozoa are eukaryotic and possess a true nucleus.

Question 7

Which of the following best describes the function of bacterial endospores in the context of human disease?

Accepted Answer

Endospores enable bacteria to survive harsh environmental conditions, contributing to persistence and transmission of disease.

Question 8

A scientist is studying a virus that causes cancer by integrating its DNA into the host genome. Which type of virus is most likely responsible for this transformation?

Accepted Answer

DNA oncogenic virus

Question 9

Which of the following scenarios best illustrates the process of bacterial conjugation?

Accepted Answer

A donor bacterium transfers a plasmid to a recipient through a pilus.

Question 10

A hospital outbreak is traced to a protozoan that is transmitted by mosquitoes. Which term best describes the role of the mosquito in this scenario?

Accepted Answer

Vector

Question 11

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that lack nucleic acids.

Question 12

A researcher observes a eukaryotic cell with a cell wall, chloroplasts, and no flagella. Which group does this organism most likely belong to?

Accepted Answer

Algae

Question 13

Which of the following best explains why Gram-negative bacteria are generally more resistant to antibiotics than Gram-positive bacteria?

Accepted Answer

Gram-negative bacteria possess an outer membrane that restricts entry of many drugs.

Question 14

A patient is infected with a nematode. Which of the following characteristics is unique to nematodes compared to platyhelminths?

Accepted Answer

Nematodes have a complete digestive system with a mouth and anus.

Question 15

Which of the following best describes the role of plasmids in bacterial genetics?

Accepted Answer

Plasmids are small, circular DNA molecules that often carry genes for antibiotic resistance.

Question 16

A mutation changes a codon from $$UAC ($$tyrosine) to $$UAA ($$stop codon). What type of mutation has occurred?

Accepted Answer

Nonsense mutation

Question 17

Which of the following best describes the lytic cycle of a bacteriophage?

Accepted Answer

The phage causes immediate lysis of the host cell after replication.

Question 18

A patient is diagnosed with a persistent viral infection. Which of the following best characterizes this type of infection?

Accepted Answer

The virus remains in the host for long periods, often with ongoing production of infectious particles.

Question 19

Which of the following is a real-world example of transformation in bacteria?

Accepted Answer

A bacterium incorporates free DNA fragments from a lysed cell into its own genome.

Question 20

Which of the following best explains why prion diseases are difficult to treat?

Accepted Answer

Prions are resistant to standard sterilization methods because they lack nucleic acids.

BIO 225 Unit 1: Microbiology Study Guide

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