Podcast
Questions and Answers
What is the primary distinction between viruses and living organisms regarding reproduction?
What is the primary distinction between viruses and living organisms regarding reproduction?
- Viruses reproduce sexually, while living organisms reproduce asexually.
- Viruses reproduce through mitosis, while living organisms reproduce through meiosis.
- Viruses reproduce at a faster rate than living organisms.
- Viruses require a host cell to reproduce, while living organisms can reproduce independently. (correct)
What is the composition of a virus particle (virion)?
What is the composition of a virus particle (virion)?
- A cell wall and cytoplasm
- RNA and a cell membrane
- DNA or RNA and a protein coat (capsid) (correct)
- A nucleus and organelles
Why does an incubation period occur after a host animal is infected with a virus before clinical signs are observed?
Why does an incubation period occur after a host animal is infected with a virus before clinical signs are observed?
- The virus is being destroyed by the host's immune system.
- The virus is mutating into a less harmful form.
- The virus is replicating and infecting a large number of cells. (correct)
- The virus is dormant during this period.
What is a key characteristic of prions that distinguishes them from viruses?
What is a key characteristic of prions that distinguishes them from viruses?
Which of the following best describes the shape and arrangement of staphylococci bacteria?
Which of the following best describes the shape and arrangement of staphylococci bacteria?
How do bacteria reproduce, and what is the name of this process?
How do bacteria reproduce, and what is the name of this process?
What is a key characteristic that differentiates vibrios from other types of bacteria?
What is a key characteristic that differentiates vibrios from other types of bacteria?
What is the main characteristic that differentiates fungi from bacteria, regarding their metabolism?
What is the main characteristic that differentiates fungi from bacteria, regarding their metabolism?
How are moulds and yeasts differentiated?
How are moulds and yeasts differentiated?
Give the correct pairing of organism and disease:
Give the correct pairing of organism and disease:
What characteristic is unique to viruses that sets them apart from bacteria, fungi, and prions?
What characteristic is unique to viruses that sets them apart from bacteria, fungi, and prions?
Why do clinical signs not appear immediately after a virus enters a host?
Why do clinical signs not appear immediately after a virus enters a host?
What is the main difference in the cellular structure between yeasts and bacilli?
What is the main difference in the cellular structure between yeasts and bacilli?
Which characteristic of prions is most responsible for their ability to cause disease?
Which characteristic of prions is most responsible for their ability to cause disease?
Which of the following cellular arrangements is characteristic of streptococci?
Which of the following cellular arrangements is characteristic of streptococci?
How does binary fission contribute to the spread of bacterial infections?
How does binary fission contribute to the spread of bacterial infections?
What fundamental role does the capsid play in the viral infection process?
What fundamental role does the capsid play in the viral infection process?
In what crucial way does the mode of reproduction of fungi differ from that of bacteria?
In what crucial way does the mode of reproduction of fungi differ from that of bacteria?
Why is the lengthy incubation period associated with prion diseases a significant concern for public health?
Why is the lengthy incubation period associated with prion diseases a significant concern for public health?
What advantage does a virus gain by having a protein coat (capsid)?
What advantage does a virus gain by having a protein coat (capsid)?
Flashcards
Virion Composition
Virion Composition
A virus particle composed of RNA or DNA (never both) forming a central core and a protein coat called the capsid.
Incubation Period (Viruses)
Incubation Period (Viruses)
The delay between initial virus infection and the appearance of clinical signs.
Prions
Prions
Small, proteinaceous infectious particles that cause infections within the central nervous system.
Bacilli
Bacilli
Signup and view all the flashcards
Vibrios
Vibrios
Signup and view all the flashcards
Cocci
Cocci
Signup and view all the flashcards
Diplococci
Diplococci
Signup and view all the flashcards
Streptococci
Streptococci
Signup and view all the flashcards
Staphylococci
Staphylococci
Signup and view all the flashcards
Spirochaetes
Spirochaetes
Signup and view all the flashcards
Binary Fission
Binary Fission
Signup and view all the flashcards
Moulds
Moulds
Signup and view all the flashcards
Yeasts
Yeasts
Signup and view all the flashcards
Study Notes
-
Viruses are very small and may not always be classified as living organisms
-
Viruses cannot reproduce without a host cell
-
A virus particle, or virion, contains instructions for creating more virus particles
-
A virus particle is composed of nucleic acid (RNA or DNA) and a protein coat called a capsid
-
After a host animal is infected, a time lag called the incubation period occurs before clinical signs appear
-
During the incubation period, viruses infect cells and increase the number of virus particles
-
Clinical signs are observed when numerous virus particles infect many cells
-
Prions are small proteinaceous particles that cause infections in the central nervous system
-
Prion infections can lead to the death of the animal
-
The incubation period for prion infections is long, ranging from 2 months to 20 years
-
Cylindrical or rod-shaped cells are called bacilli
-
Curved bacilli are known as vibrios
-
Spherical cells are called cocci
-
Cocci that exist in pairs after cell division are called diplococci
-
Cocci that form chains are called streptococci
-
Cocci that divide randomly and form grape-like clusters are called staphylococci
-
Spiral or helical cells are called spirochaetes
-
Bacteria reproduce asexually through binary fission, dividing into two identical daughter cells
-
Only a few types of fungi are able to infect animals
-
Fungi grow aerobically and get energy from organic substances
-
Fungi are divided into two categories: moulds and yeasts
-
Moulds are multicellular, examples include ringworm dermatophytes
-
Yeasts are unicellular, examples include Malassezia pachydermatis and Candida albicans
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
