BIOD 121 EXAM 4 2026 PRACTICE QUESTIONS
AND SOLUTIONS GUARANTEED PASS
◉ Which of the following is TRUE regarding a positive TB skin test?
4
- Positive test = red indurated area
- Indicates the individual has been exposed to MTB
- Indicates the individual could have a active tuberculosis
- Indicates the individual may have latent tuberculosis
- Positive test = no skin changes. Answer: Positive test = red
indurated area
Indicates the individual has been exposed to MTB
Indicates the individual could have a active tuberculosis
Indicates the individual may have latent tuberculosis
◉ Which of the following are TRUE regarding interferon-gamma
release assays? 3
- Performed by injecting a small amount of tuberculin into the skin
- Testing helps differentiate latent from active tuberculosis
- Less subjective to reader bias and errors
,- Testing requires a blood sample
- This test is not affected by the BCG vaccine. Answer: - Less
subjective to reader bias and errors
- Testing requires a blood sample
- This test is not affected by the BCG vaccine
◉ What is the appearance of mycobacteria in gram-stained smears?
- Gram positive cocci
- Gram positive rods
- Gram negative cocci
- Gram negative rods
- Stain very poorly - if at all. Answer: Stain very poorly - if at all
◉ What is the recommended specimen collection procedure for
SPUTUM samples (for Mycobacterial cultures)?
- 1 morning sample
- 3 samples (in one day)
- 3-5 morning samples (over a week)
- 2 samples (in the late aftenoon). Answer: 3-5 morning samples
(over a week)
,◉ What is the recommended specimen collection procedure for
URINE samples (for Mycobacterial cultures)?
- 1 morning sample
- 3 samples (in one day)
- 3-5 morning samples (over a week)
- 2 samples (in the late aftenoon). Answer: 3-5 morning samples
(over a week)
◉ What type of samples need No decontamination - Centrifuge &
inoculate media 2
- CSF
- Pleural fluid
- sputum
- urine
- skin/wound for m. marinum. Answer: - CSF
- Pleural fluid
◉ What type of samples need : Decontaminate specimen before
inoculating media , 3
- CSF
, - Pleural fluid
- sputum
- urine
- skin/wound for m. marinum. Answer: - sputum
- urine
- skin/wound for m. marinum
◉ How should gastric aspirates be handled if they cannot be
processed within 4 hours?
- Neutralize specimen with sodium bicarbonate
- Store specimen in a refrigerator
- Request a new specimen
- Add N-acetyl-L-cystine to the specimen. Answer: Neutralize
specimen with sodium bicarbonate
◉ Which mycobacteria are rapid growers? 2
- M. tuberculosis
- M. gordonea
- M. bovis
- M. marinum
AND SOLUTIONS GUARANTEED PASS
◉ Which of the following is TRUE regarding a positive TB skin test?
4
- Positive test = red indurated area
- Indicates the individual has been exposed to MTB
- Indicates the individual could have a active tuberculosis
- Indicates the individual may have latent tuberculosis
- Positive test = no skin changes. Answer: Positive test = red
indurated area
Indicates the individual has been exposed to MTB
Indicates the individual could have a active tuberculosis
Indicates the individual may have latent tuberculosis
◉ Which of the following are TRUE regarding interferon-gamma
release assays? 3
- Performed by injecting a small amount of tuberculin into the skin
- Testing helps differentiate latent from active tuberculosis
- Less subjective to reader bias and errors
,- Testing requires a blood sample
- This test is not affected by the BCG vaccine. Answer: - Less
subjective to reader bias and errors
- Testing requires a blood sample
- This test is not affected by the BCG vaccine
◉ What is the appearance of mycobacteria in gram-stained smears?
- Gram positive cocci
- Gram positive rods
- Gram negative cocci
- Gram negative rods
- Stain very poorly - if at all. Answer: Stain very poorly - if at all
◉ What is the recommended specimen collection procedure for
SPUTUM samples (for Mycobacterial cultures)?
- 1 morning sample
- 3 samples (in one day)
- 3-5 morning samples (over a week)
- 2 samples (in the late aftenoon). Answer: 3-5 morning samples
(over a week)
,◉ What is the recommended specimen collection procedure for
URINE samples (for Mycobacterial cultures)?
- 1 morning sample
- 3 samples (in one day)
- 3-5 morning samples (over a week)
- 2 samples (in the late aftenoon). Answer: 3-5 morning samples
(over a week)
◉ What type of samples need No decontamination - Centrifuge &
inoculate media 2
- CSF
- Pleural fluid
- sputum
- urine
- skin/wound for m. marinum. Answer: - CSF
- Pleural fluid
◉ What type of samples need : Decontaminate specimen before
inoculating media , 3
- CSF
, - Pleural fluid
- sputum
- urine
- skin/wound for m. marinum. Answer: - sputum
- urine
- skin/wound for m. marinum
◉ How should gastric aspirates be handled if they cannot be
processed within 4 hours?
- Neutralize specimen with sodium bicarbonate
- Store specimen in a refrigerator
- Request a new specimen
- Add N-acetyl-L-cystine to the specimen. Answer: Neutralize
specimen with sodium bicarbonate
◉ Which mycobacteria are rapid growers? 2
- M. tuberculosis
- M. gordonea
- M. bovis
- M. marinum
