Question 1

Which of the following is defined as a disease-producing microorganism?
A) Normal flora
B) Pathogen
C) Arthropod
D) Parasite

Accepted Answer

A pathogen is defined as a disease-producing microorganism. Normal flora are microorganisms that typically live in or on the body without causing harm. Arthropods are a type of animal, such as insects and spiders. Parasites are organisms that live on or inside another organism and rely on that host for survival, but not all parasites are necessarily disease-producing.

Question 2

What is the significance of bacterial spore formation? The bacterium
A) becomes more sensitive to the effects of antibiotics.
B) becomes more resistant to harsh environmental conditions.
C) increases its reproductive activity.
D) permanently loses its ability to cause disease.

Accepted Answer

Bacterial spore formation is significant because it allows the bacterium to become more resistant to harsh environmental conditions such as high temperature, radiation, and chemical disinfectants. Spores can remain dormant for long periods of time until more favorable conditions arise, allowing the bacterium to survive and potentially continue to reproduce. Spore formation does not make the bacterium more sensitive to antibiotics nor does it increase reproductive activity. While some spore-forming bacteria may lose their ability to cause disease in their spore form, this is not a universal characteristic.

Question 3

Clostridium tetani and Clostridium difficile
A) are gram-negative bacilli.
B) are anaerobic.
C) are always pathogenic.
D) cause the "tineas," such as athlete's foot and ringworm.

Accepted Answer

Clostridium tetani and Clostridium difficile are both anaerobic bacteria, meaning they can only survive in the absence of oxygen. They are not gram-negative, always pathogenic, or associated with tinea infections.

Question 4

Which of the following is least descriptive of staphylococci?
A) Grapelike arrangement
B) Bacterial
C) Gram-positive
D) Underlying cause of rheumatic fever

Accepted Answer

Staphylococci are a type of gram-positive bacteria that are typically arranged in grapelike clusters. They can cause a variety of infections, ranging from minor skin infections to more serious illnesses such as sepsis. However, they are not an underlying cause of rheumatic fever, which is primarily caused by group A Streptococcus bacteria.

Question 5

Cocci,bacilli,and curved rods are classified as
A) viruses.
B) pathogens.
C) bacteria.
D) parasites.

Accepted Answer

Cocci, bacilli, and curved rods are all types of bacteria.

Question 6

An abscess is
A) an example of a systemic infection.
B) always viral in origin.
C) an example of a mycotic infection.
D) an example of a localized infection.

Accepted Answer

An abscess is a localized infection characterized by a collection of pus, which can occur anywhere in the body. It is not a systemic infection, as it is confined to a specific area. It is also not always viral in origin, nor is it a mycotic infection. Therefore, the best choice is D, an example of a localized infection.

Question 7

Influenza is best described as a(n)
A) localized infection.
B) allergic reaction.
C) bacterial infection.
D) systemic infection.

Accepted Answer

Influenza is a systemic infection, meaning it affects the whole body rather than being localized to one specific area. It is caused by a virus and can cause symptoms throughout the body, such as fever, fatigue, and muscle aches.

Question 8

Bacteria
A) include cocci, bacilli, and curved rods.
B) are not part of the normal flora of the intestines.
C) cause mycotic infections.
D) include mold and yeast.

Accepted Answer

Bacteria include various shapes such as cocci, bacilli, and curved rods. Option B is incorrect as bacteria can be part of the normal flora of intestines. Option C is incorrect as mycotic infections are caused by fungi, not bacteria. Option D is incorrect as mold and yeast are types of fungi, not bacteria.

Question 9

Which of the following are classified as gram-positive and gram-negative?
A) Viruses
B) Bacteria
C) Fungi
D) Yeast

Accepted Answer

Gram-positive and gram-negative refer to the cell wall structure of bacteria. Viruses, fungi, and yeast do not have a cell wall structure that can be classified in this way.

Question 10

Which of the following is least descriptive of Candida albicans?
A) Causative organism of impetigo
B) Fungal infection
C) Yeast infection
D) Antibiotic-induced superinfection

Accepted Answer

Candida albicans is not the causative organism of impetigo. Impetigo is caused by Staphylococcus aureus or Streptococcus pyogenes bacteria.

Question 11

Rickettsiae and chlamydiae are classified as
A) viruses.
B) bacteria.
C) arthropods.
D) bacilli.

Accepted Answer

Rickettsiae and chlamydiae are bacteria, specifically Gram-negative intracellular bacteria. They are different from viruses and arthropods. Bacilli is a general term for rod-shaped bacteria and is not a specific classification.

Question 12

Streptococci and staphylococci are
A) viruses.
B) gram-positive bacteria.
C) arthropods.
D) parasites.

Accepted Answer

Streptococci and staphylococci are both types of gram-positive bacteria.

Question 13

Which highly coiled microorganism resembles a corkscrew?
A) Staphylococcus
B) Streptococcus
C) Bacillus
D) Spirillum

Accepted Answer

Spirillum is a highly coiled microorganism that resembles a corkscrew. Staphylococcus and Streptococcus are spherical bacteria, while Bacillus is typically rod-shaped.

Question 14

Tetanus,tuberculosis,and diphtheria are
A) staphylococcal infections.
B) caused by a spirochete.
C) localized infections.
D) bacterial infections.

Accepted Answer

Tetanus, tuberculosis, and diphtheria are all bacterial infections caused by specific types of bacteria: Clostridium tetani, Mycobacterium tuberculosis, and Corynebacterium diphtheriae, respectively.

Question 15

Which of the following requires another living host for its continued existence?
A) Arthropod
B) Pathogen
C) Parasite
D) Bacterium

Accepted Answer

Parasites are organisms that live in or on another organism, called the host, and rely on the host for its continued existence. Therefore, parasites require another living host for their survival. Arthropods can survive independently, and some bacteria can also survive without a host. Pathogens, such as viruses, can cause disease in a host but they do not necessarily require a host for their survival.

Question 16

Which of the following describes the signs and symptoms that develop in response to a pathogen?
A) Syndrome
B) Allergy
C) Infection
D) Immunity

Accepted Answer

The answer of Which of the following describes the signs...

Question 17

Which word best characterizes Typhoid Mary?
A) Immune
B) Symptomatic
C) Carrier
D) Fomite

Accepted Answer

Typhoid Mary was known as a carrier because she carried and spread the typhoid fever bacteria without showing symptoms herself.

Question 18

Rickettsiae are
A) classified as fungi.
B) viruses.
C) often carried by fleas, ticks, and body lice.
D) arthropod vectors.

Accepted Answer

Rickettsiae are a type of bacteria that are often transmitted to humans through the bites of infected fleas, ticks, and body lice. They are not classified as fungi, viruses, or arthropod vectors themselves, but rather they utilize arthropods as vectors to spread.

Question 19

Which of the following is least descriptive of Treponema pallidum?
A) Causes syphilis
B) Classified as a bacterium
C) Is most often spread by the fecal-oral route
D) Is a spirochete

Accepted Answer

Treponema pallidum is primarily transmitted through sexual contact or from mother to child during pregnancy or childbirth, rather than through the fecal-oral route.

Question 20

Which of the following is called the acid-fast bacillus?
A) Staphylococcus aureus
B) Salmonella typhi
C) Mycobacterium tuberculosis
D) Clostridium tetani

Accepted Answer

Acid-fast bacilli refer to bacteria that have a waxy cell wall that prevents them from being easily stained with traditional Gram stains. Mycobacterium tuberculosis is a well-known example of an acid-fast bacillus, while the other options are not.

Quiz 5: Microbiology Basics

Which of the following is defined as a disease-producing microorganism?

What is the significance of bacterial spore formation? The bacterium

Clostridium tetani and Clostridium difficile

Which of the following is least descriptive of staphylococci?

Cocci,bacilli,and curved rods are classified as

An abscess is

Influenza is best described as a(n)

Bacteria

Which of the following are classified as gram-positive and gram-negative?

Which of the following is least descriptive of Candida albicans?

Rickettsiae and chlamydiae are classified as

Streptococci and staphylococci are

Which highly coiled microorganism resembles a corkscrew?

Tetanus,tuberculosis,and diphtheria are

Which of the following requires another living host for its continued existence?

Which of the following describes the signs and symptoms that develop in response to a pathogen?

Which word best characterizes Typhoid Mary?

Rickettsiae are

Which of the following is least descriptive of Treponema pallidum?

Which of the following is called the acid-fast bacillus?