Biology 2420 Lecture Exam 3 Test Questions and Correct Answers
6 views 0 purchase
Course
BIO 2420
Institution
BIO 2420
What are the characteristics of gram-positive bacteria? Gram positive bacteria *stains purple* They can be cocci; oval shaped They can be bacilli: rod-shaped
In Genus Staphylococcus, the species most commonly associated w/ human infections are 1. Staphylococcus aureus 2. S. epidermis
In the Genus...
Biology 2420 Lecture Exam 3 Test
Questions and Correct Answers
What are the characteristics of gram-positive bacteria? ✅Gram positive bacteria
*stains purple*
They can be cocci; oval shaped
They can be bacilli: rod-shaped
In Genus Staphylococcus, the species most commonly associated w/ human infections
are ✅1. Staphylococcus aureus
2. S. epidermis
In the Genus Staphylococcus, what is the *main* species that infects *all* people
despite the state of their immune system ✅Staphylococcus aureus
In the Genus Staphylococcus, which species causes infections mainly in
immunocompromised patients? ✅S. epidermis
The individuals who are susceptible to S. epidermis include... ✅Those who have
diabetes, the elderly, cancer patients, newborn babies, organ recipients, and AIDS
patients
What virulent factors are seen in Staphylococcus aureus? ✅1. Beta-lactamase
(penicillinase); Breaks down penicillin
2. Cytolytic toxins; Hemolysins (destroy red blood cells) and Leukocidins (destroy white
blood cells)
What is the mode of transmission for Staphylococcus aureus? ✅Fomites (objects) and
direct contact
What are examples of cutaneous infections caused by Staphylococcal aureus? ✅a.)
Folliculitis, furuncles, and carbuncles
b.) Post-operative wound infections (surgical incisions)
What are the two systemic diseases caused by Staphylococcus aureus? ✅1.
Staphylococcal toxic shock syndrome
2. Bacteremia
Staphylococcal toxic shock syndrome ✅Not very common, but can happen when a
specific strain with toxins result in this disease
, What are the symptoms of Staphylococcus toxic shock syndrome? ✅Fever, vomiting,
*red rash* and *extremely low blood pressure*
Bacteremia ✅The presence of bacteria in the blood, from where it can access other
organs in the body
What are the symptoms of bacteremia? ✅Fever, low blood pressure, and systemic
inflammation which lead to *sepsis* and *septic shock*
How is Staphylococcus toxic shock syndrome acquired? ✅Through a tampon during
menstruation
How is bacteremia acquired? ✅Spreads from skin infection
From IV catheter contamination
From surgery
How are the infections with S.aureus diagnosed? ✅Culture followed by identification
a. Serotyping Test
b. *Coagulase Test*
What is a dangerous strain found in S. aureus? ✅1. Methicillin Resistant
Staphylococcus aureus
Why should health care provides be well informed about Methicillin Resistant
Staphylococcus aureus? ✅It's a *multi-resistant* organism that poses an
epidemiological problem in the hospital setting. Meaning, it is resistant to a variety of
antibiotics, as a result, it is EXTREMELY DIFFICULT to treat
True or false? Vancomycin Resistant MRSA strains are also emerging ✅True
How does one treat Staphylococcus aureus? ✅In order to treat S. aureus, a
susceptibility sensitivity test must be done first
Group A Streptococcus; Streptococcus pyogenes has what kind of hemolytic pattern?
✅Beta-hemolytic
What are the virulence factors found in Streptococcus pyogenes? ✅Streptolysins:
Destroys red blood cells
Leukocidins: Kill white blood cells
What is the mode of transmission for Streptococcus pyogenes? ✅Respiratory droplets
and fomites (objects)
What streptococcal diseases are caused by Streptococcus pyogenes? ✅1. Pharyngitis
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller twishfrancis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
