Biology 250 Final Exam Revision Questions with Correct Answers 2024/2025
4 views 0 purchase
Course
Biology 250
Institution
Biology 250
which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water? - -ethylene oxide
A scientist develops a new medication that is a protein compound and that must be administered by
injection. Which of the following would be the most effective and safest...
Biology 250 Final Exam Revision Questions with
Correct Answers 2024/2025
which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?
- -✓ethylene oxide
A scientist develops a new medication that is a protein compound and that must be administered by
injection. Which of the following would be the most effective and safest means of preparing a sterile
solution of the new medication? - -✓filtration
Why are endospores used to measure the effectiveness of autoclave sterilization? - -✓endospores are
very hard to destroy
which of the following is an example of pasteurization? - -✓heat is used to kill potential pathogens in
apple juice
which is CORRECT regarding the rate of microbial death? - -✓cells in a culture die at a constant rate?
which of the following factors will influence the action of antimicrobial agents? - -✓- the number of
microorganisms
-the type of microorganisms present
- temperature and ph
- mode and dosage of the agent
which of the following is NOT a target of drugs that inhibit protein synthesis? - -✓interference with
alanine - alanine bridges in tetrapeptide
an antibiotic is - -✓a naturally occurring compound that kills microbes or inhibits their growth
,An antimicrobial that inhibits cell wall synthesis will result in which of the following? - -✓cells become
more susceptible to osmotic pressure
which of the following is NOT an approach to combat drug-resistant bacteria? - -✓flood a patients
system with healthy bacteria to quickly remove access to nutrients and starve the pathogen
the mechanism of action of the antibiotic rifampin (used to treat tuberculosis infections) is - -✓inhibition
of nucleic acid synthesis
the mechanism of action of the antimicrobial amphotericin B id - -✓disruption of the cytoplasmic
membrane
which of the following statements about drug resistance is INCORRECT? - -✓it is not found in gram-
positive bacteria
drug-resistant populations of microbes arise when - -✓exposure to drugs selectively kills sensitive cells,
allowing overgrowth of resistant cells
a compound is extracted from a microbial culture and is modified in the laboratory for use as an oral
medication. This product would be a - -✓semisynthetic antimicrobial
Which group of synthetic antimicrobials act as anti-metabolic drugs because they are structural analogs
of para-aminobenzoic acid (PABA)? - -✓sulfonamides
which group of antimicrobials prevent the formation of a peptide bond in protein synthesis? - -
✓chloramphenicol
microbes known as resident microbiota are - -✓microorganisms that remain with the person throughout
most of their life
Biological transmission differs from mechanical transmission in that biological transmission - -✓involves
reproduction of a pathogen in an arthropod vector prior to transmission
, the incidence (new cases) of scarlet fever in the year 2000 in the United States was 12.43/100,000 cases.
This means - -✓there were 12.43 new cases of scarlet fever for every 100,000 people in the United
States in the year 2000
which of then following situations is NOT a way in which a baby acquires normal microbiota? - -
✓microbes cross the placenta during pregnancy
a potential antimicrobial drug is tested and found to strip away the capsules made by certain pathogenic
bacteria. How would this drug affect the bacteria's ability to cause disease? - -✓the phagocytes would be
better able to ingest the bacteria
properties that contribute to virulence - -✓are determined by both the microbe and the host, and may
evolve over time.
the bacterium that causes tuberculosis can be expelled from the lungs by a cough and remain viable in
the air for an hour or more. If a person inhales the bacteria from the air, then _______ transmission has
occurred - -✓airborne
inanimate objects involved in the indirect transmission of pathogens are called - -✓fomites
rickettsia prowazekii causes epidemic typhus, which is also called louse -borne typhus because the
disease is transmitted by human body louse, pedicures humans. The body louse serves as a - -✓reservoir
Exotoxins are ________, but endotoxins are ________. - -✓proteins; lipopolysaccharide-lipoprotein
complexes
which type of bacterial toxin is matched iNCORRECTLY with its description? - -✓toxemia: a toxin
produced during a viral infection
which of the following statements regarding the demostration of the etiology of disease is FALSE? - -
✓the suspect agent must be the only potential pathogen present in disease cases
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 masigabethwel. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
