|1. An antiseptic is used when one needs to remove microbes from which of the following?|
a. toilet surfaces2. Some antimicrobial treatments kill microbes; some inhibit growth. Which term refers to an agent that inhibits bacterial growth?
b. restaurant glassware
c. foods prior to canning
d. food preparation areas
e. skin prior to injection
a. Fungicidal3. Which of the following is not a major target for action of antimicrobials?
a. Cell membranes4. Decimal reduction time is the time in minutes in which of the population at a given temperature will be killed
c. Nucleic acids
a. 90%5. Some microbes are very resistant to antimicrobial chemicals. Which of the following would be the most difficult to kill?
a. Pseudomonas aeruginosa6. Which type of radiation is least effective in killing microbes?
b. Streptococcus pneumoniae
c. Mycobacterium tuberculosis
d. Escherichia coli
e. Clostridium endospores
a. Gamma rays7. Alcohol is most effective when used as a solution at which of following concentrations?
b. X rays
c. High-energy electron beams
d. Ultraviolet rays
a. 70%8. Which is not a characteristic of the autoclave?
a. The use of moist heat9. You make a dilution by transferring 1 mL of a culture into 99 mL of saline. You then repeat the operation by transferring 1 mL of the diluted culture into another 99 mL bottle of saline. When you inoculate an agar plate with 1.0 mL of the final dilution and obtain 38 colonies. What was the concentration cells in the original culture?
b. The use of high temperatures
c. The requirement for long (hours) exposure times
d. The use of high pressures
e. The ability to sterilize solutions with endospores
a. 3.8 x 10210. Which of the following is probably NOT bactericidal?
b. 3.8 x 103
c. 3.8 x 104
d. 3.8 x 105
e. 3.8 x 106
a. lyophilization11. Choose the best method for the sterilization of an enzyme solution
b. ionizing radiation
e. ethylene oxide gas
a. Pasteurization12. The bactericidal effect of UV light is attributed to damage of which of the following?
b. Dry heat
a. proteins13. All of the following methods are used for food preservation except:
e. plasma membranes
a. Deep freezing14. A certain bacteria has a generation time of 12 minutes. A culture of 1000 bacteria per mL would be expected to have what concentration of bacteria after an hour?
c. Commercial canning
e. Osmotic pressure
a. 3.2 x 103 cells/mL15. All of the following are examples of microbial control using heavy metals except which of the following?
b. 3.2 x 104 cells/mL
c. 3.2 x 105 cells/mL
d. 3.2 x 106 cells/mL
e. 3.2 x 107 cells/mL
a. mouthwash solution containing zinc chloride16. The following may be listed on the ingredients of your favorite snack food. Which of the following is not antimicrobial?
b. algae control in swimming pools using copper sulfate
c. antiseptic solution containing mercurochrome
d. benzoyl peroxide used for acne treatment
e. burn treatment using silver-sulfadiazine ointment
a. calcium propionate17. You have a 200 mg/ml antibiotic solution. The first tube contains undiluted antibiotic solution and successive tubes contain serial dilutions (1:2, 1:4, etc.) of the antibiotic;. You then inoculate each tube with Salmonella. Bacteria grow in tubes 4, 5, and 6. You subculture bacteria from tubes 1 through 4 to nutrient broth. Growth occurs in tubes 3 and 4. You can conclude that the MBC (minimum bactericidal concentration) is:
c. sodium benzoate
d. sorbic acid
e. potassium sorbate
a. 25 mg/mL18. The first antibiotic discovered was:
b. 12.5 mg/mL
c. 100 mg/mL
d. 50 mg/mL
e. 200 mg/mL
a. Streptomycin19. Which of the following antibiotics inhibits cell wall synthesis?
d. Sulfa drugs
a. Chloramphenicol20. Which of the following antibiotics inhibits protein synthesis?
a. Isoniazid21. Which of the following is not used for treating bacterial infections?
a. Methicillin22. Which antimicrobial works by inhibiting the synthesis of mycolic acid?
a. Penicillin23. Which of the following antibiotics inhibits folic acid synthesis?
a. Tetracycline24. Which antifungal drug is commonly used for systemic fungal infections?
a. Tetracycline25. Which is the drug of choice for the treatment of malaria?
d. Amphotericin B
a. Flagyl26. Which of the following mechanisms is antifungal?
a. Inhibit ergosterol synthesis
b. Inhibit peptidoglycan synthesis
c. Cause muscle spasms
d. Inhibit 70S ribosomes
e. Interfere with anaerobic metabolism