BMAT Case Studies & Practical Application 3

Question 1

A clinical case describes a child with recurrent infections, low immunoglobulin levels, and absent B-cells. Which condition does this most likely represent?

Accepted Answer

X-linked agammaglobulinemia (Bruton's disease)

Answer

X-linked agammaglobulinemia is characterized by absent B-cells and very low immunoglobulins due to a BTK gene mutation, leading to recurrent bacterial infections.

Question 2

A BMAT problem states that a car decelerates uniformly from 30 m/s to rest in 6 seconds. What is the magnitude of deceleration?

Accepted Answer

5 m/s²

Answer

Deceleration = change in velocity / time = 30/6 = 5 m/s².

Question 3

A patient is found to have a serum potassium of 6.8 mmol/L. Which ECG change is most likely to be seen?

Accepted Answer

Peaked T waves

Answer

Hyperkalemia characteristically produces tall, peaked T waves on ECG, with worsening changes at higher levels including widened QRS and sine-wave pattern.

Question 4

A scientific paper claims that coffee consumption causes reduced Alzheimer's risk based on a survey study. What is the most important methodological limitation?

Accepted Answer

Correlation cannot establish causation; confounding variables may explain the association

Answer

Observational studies can identify associations but cannot prove causation due to potential confounders such as lifestyle, diet, or genetic factors.

Question 5

In a genetics case, two parents who are carriers of an autosomal recessive condition have a child. What is the probability that their next child will be an affected carrier?

Accepted Answer

25%

Answer

Each pregnancy from two carriers gives a 25% chance of an affected (homozygous recessive) child, independent of previous pregnancies.

BMAT - Assessment Practice Test

BMAT - Assessment Practice Test

BMAT Case Studies & Practical Application 3