BIO 250 FINAL EXAM QUESTIONS AND ANSWERS 2025
which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?
- (ANSWER)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? - (ANSWER)filtration
Why are endospores used to measure the effectiveness of autoclave sterilization? -
(ANSWER)endospores are very hard to destroy
which of the following is an example of pasteurization? - (ANSWER)heat is used to kill potential
pathogens in apple juice
which is CORRECT regarding the rate of microbial death? - (ANSWER)cells in a culture die at a constant
rate?
which of the following factors will influence the action of antimicrobial agents? - (ANSWER)- 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? - (ANSWER)interference
with alanine - alanine bridges in tetrapeptide
an antibiotic is - (ANSWER)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? - (ANSWER)cells
become more susceptible to osmotic pressure
, BIO 250 FINAL EXAM QUESTIONS AND ANSWERS 2025
which of the following is NOT an approach to combat drug-resistant bacteria? - (ANSWER)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 -
(ANSWER)inhibition of nucleic acid synthesis
the mechanism of action of the antimicrobial amphotericin B id - (ANSWER)disruption of the cytoplasmic
membrane
which of the following statements about drug resistance is INCORRECT? - (ANSWER)it is not found in
gram-positive bacteria
drug-resistant populations of microbes arise when - (ANSWER)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 - (ANSWER)semisynthetic antimicrobial
Which group of synthetic antimicrobials act as anti-metabolic drugs because they are structural analogs
of para-aminobenzoic acid (PABA)? - (ANSWER)sulfonamides
which group of antimicrobials prevent the formation of a peptide bond in protein synthesis? -
(ANSWER)chloramphenicol
microbes known as resident microbiota are - (ANSWER)microorganisms that remain with the person
throughout most of their life
Biological transmission differs from mechanical transmission in that biological transmission -
(ANSWER)involves reproduction of a pathogen in an arthropod vector prior to transmission
which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?
- (ANSWER)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? - (ANSWER)filtration
Why are endospores used to measure the effectiveness of autoclave sterilization? -
(ANSWER)endospores are very hard to destroy
which of the following is an example of pasteurization? - (ANSWER)heat is used to kill potential
pathogens in apple juice
which is CORRECT regarding the rate of microbial death? - (ANSWER)cells in a culture die at a constant
rate?
which of the following factors will influence the action of antimicrobial agents? - (ANSWER)- 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? - (ANSWER)interference
with alanine - alanine bridges in tetrapeptide
an antibiotic is - (ANSWER)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? - (ANSWER)cells
become more susceptible to osmotic pressure
, BIO 250 FINAL EXAM QUESTIONS AND ANSWERS 2025
which of the following is NOT an approach to combat drug-resistant bacteria? - (ANSWER)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 -
(ANSWER)inhibition of nucleic acid synthesis
the mechanism of action of the antimicrobial amphotericin B id - (ANSWER)disruption of the cytoplasmic
membrane
which of the following statements about drug resistance is INCORRECT? - (ANSWER)it is not found in
gram-positive bacteria
drug-resistant populations of microbes arise when - (ANSWER)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 - (ANSWER)semisynthetic antimicrobial
Which group of synthetic antimicrobials act as anti-metabolic drugs because they are structural analogs
of para-aminobenzoic acid (PABA)? - (ANSWER)sulfonamides
which group of antimicrobials prevent the formation of a peptide bond in protein synthesis? -
(ANSWER)chloramphenicol
microbes known as resident microbiota are - (ANSWER)microorganisms that remain with the person
throughout most of their life
Biological transmission differs from mechanical transmission in that biological transmission -
(ANSWER)involves reproduction of a pathogen in an arthropod vector prior to transmission
