Free MLPAO Basic Biology, Anatomy, and Physiology Questions and Answers

Question 1

Which of the following plated media is enriched?

Accepted Answer

Chocolate Agar

Answer

Chocolate Agar is considered an enriched medium because it contains lysed red blood cells, which release essential growth factors like Factor X (hemin) and Factor V (NAD). These factors are crucial for the growth of fastidious bacteria, such as *Haemophilus* species and *Neisseria* species, which cannot grow on basic media like Blood Agar. The enrichment allows for the cultivation of more demanding microorganisms.

Question 2

The administration of CPR on an adult requires how many chest compressions performed immediately before a series of two breaths is given?

Accepted Answer

30

Answer

According to current CPR guidelines for adults, the recommended ratio of chest compressions to breaths is 30 compressions followed by 2 breaths. This sequence should be repeated until emergency medical services arrive or the person shows signs of recovery. Maintaining a compression rate of 100-120 compressions per minute is also crucial for effective CPR.

Question 3

Which of the following clinical signs indicates that a person is choking and has complete airway obstruction?

Accepted Answer

No chest movement

Answer

In the case of complete airway obstruction due to choking, the person will be unable to move air into or out of their lungs. This directly results in no chest movement (or very minimal, ineffective movement) and an inability to cough, speak, or breathe. The lack of chest movement is a critical sign indicating a complete blockage of airflow.

Question 4

A volumetric flask that is calibrated at 20°C would be expected to contain more volume if the:

Accepted Answer

liquid is heated before measurement.

Answer

A volumetric flask is calibrated to contain a specific volume at a standard temperature, typically 20°C. If the liquid is heated before measurement, both the liquid and the flask will expand. However, liquids generally have a higher coefficient of thermal expansion than glass. Therefore, if the flask is filled to the calibration mark with a heated liquid, the actual volume of the liquid contained will be slightly more than the volume the flask was calibrated to hold at 20°C.

Question 5

When urine microscopy is performed, the specimen must be centrifuged at 1,500 3,000 rpm for how many minutes?

Accepted Answer

5

Answer

For urine microscopy, the specimen must be centrifuged at 1,500-3,000 rpm for 5 minutes. This specific centrifugation speed and duration are optimized to concentrate the formed elements (cells, casts, crystals) in the urine sediment. It ensures these delicate structures are concentrated enough for microscopic examination without causing excessive damage or distortion, allowing for accurate identification.

MLPAO - Medical Laboratory Professionals Association of Ontario Practice Test

MLPAO - Medical Laboratory Professionals Association of Ontario Practice Test

Free MLPAO Basic Biology, Anatomy, and Physiology Questions and Answers