27 Jan A bacterial strain has

• Question 1

Chlorohexidine, chlorxylenol, or iodine compounds are often found in antimicrobial soaps used as surgical scrubs. These are examples of ______________?

Answers: Antibiotics

Disinfectants

Antiseptics

Sterilants

• Question 2

Based on the results of a disk diffusion antimicrobial susceptibility test, the growth of an organism was found to be significantly inhibited by the antimicrobial drug. Based on this observations, the bacteria is described as being __________ to the drug.

Answers: Resistant

Intermediate

Susceptible

Unaffected

• Question 3

The clear area where no bacteria are growing around the chemical disk is called a zone of inhibition.

Answers: True

False

• Question 4

UV radiation causes the formation of adenine dimers.

Answers: True

False

• Question 5

In which items or situations might you want to reduce or limit microbial growth?

Answers: Drinking water

Surgical incision

Storing leftover food

All of the above

• Question 6

All of the following are possible outcomes of selecting an antibiotic that is ineffective to treat a particular infection EXCEPT?

Answers: The infection may worsen

The targeted pathogen will decrease in number and the infection will resolve

The targeted pathogen will continue to grow and cause disease

The normal microbiota may be destroyed, enabling the targeted pathogen to grow even better

• Question 7

The sources of all antimicrobial drugs are fungi and other microorganisms.

Answers: True

False

• Question 8

A drug which reduces the normal microbiota but doesn’t effectively target the causative agent of an infection may actually make the infection worse.

Answers: True

False

• Question 9

An antibiotic which interferes with the activity of ribosomes would have the most effect on which of the following?

Answers: DNA replication

The cell wall

Protein synthesis

Cell membrane function

• Question 10

Which of the following is a chemical means of controlling microbial growth?

Answers:

Disinfectant

High temperature

Scrubbing action

Ultraviolet radiation

• Question 11

An antimicrobial, such as isoniazid, that is only effective against mycobacterial species would be referred to as a __________ drug.

Answers: Broad spectrum

Narrow spectrum

Intermediate spectrum

Naturally occurring

• Question 12

Which of the following processes removes or destroys endospores?

Answers: Antisepsis

Disinfection

Sterilization

Sanitization

• Question 13

Which is the preferred media for use with the Kirby-Bauer susceptibility test?

Answers: Trypticase soy agar

Mueller Hinton agar

Blood agar

Chocolate agar

• Question 14

The wavelength of ultraviolet radiation is shorter than the wavelengths of visible light True

False

• Question 15

A bacterial strain has been isolated from a patient’s urine specimen and a Kirby-Bauer susceptibility test has been performed on the strain. There is no zone of inhibition around Antibiotic X. Which statement correctly describes this situation?

Antibiotic X is resistant to the bacteria.

Antibiotic X is resistant to the patient.

The bacteria is resistant to Antibiotic X.

The patient is resistant to Antibiotic X.