BMAT Case Studies & Practical Application 2 — Questions and Answers
Question 1: A researcher notices that a drug trial shows a statistically significant result (p=0.04) but the effect size is very small. What is the most appropriate conclusion?
- The drug is clinically effective and should be approved immediately
- Statistical significance alone does not confirm clinical relevance (Correct answer)
- The trial should be repeated with fewer participants
- A p-value below 0.05 always indicates a meaningful effect
Correct answer: Statistical significance alone does not confirm clinical relevance
Statistical significance reflects sample size and variance, not the magnitude of clinical benefit, so effect size must also be considered.
Question 2: In a BMAT Section 2 biology question, a student is asked why active transport requires ATP. Which response best demonstrates applied understanding?
- ATP provides electrons for ion channels
- ATP hydrolysis powers conformational changes in carrier proteins against concentration gradients (Correct answer)
- ATP increases membrane permeability directly
- ATP converts glucose into ions for transport
Correct answer: ATP hydrolysis powers conformational changes in carrier proteins against concentration gradients
Active transport moves solutes against their concentration gradient using energy from ATP hydrolysis to drive protein conformational changes.
Question 3: A patient presents with chest pain, sweating, and pain radiating to the left arm. The ECG shows ST elevation. Which immediate action is most appropriate?
- Administer oral antihistamines and observe
- Arrange urgent percutaneous coronary intervention (PCI) or thrombolysis (Correct answer)
- Prescribe antacids and discharge
- Order an elective MRI within 48 hours
Correct answer: Arrange urgent percutaneous coronary intervention (PCI) or thrombolysis
ST-elevation myocardial infarction (STEMI) requires immediate reperfusion therapy — either PCI or thrombolysis — to minimize myocardial damage.
Question 4: A study reports a relative risk reduction of 50% for a new treatment, but the absolute risk reduction is only 1%. What does this imply about the number needed to treat (NNT)?
- NNT = 2, indicating a highly efficient treatment
- NNT = 100, meaning 100 patients must be treated to prevent one event (Correct answer)
- NNT = 50, reflecting the relative risk reduction directly
- NNT cannot be calculated from this data
Correct answer: NNT = 100, meaning 100 patients must be treated to prevent one event
NNT = 1 / absolute risk reduction = 1 / 0.01 = 100, which often indicates low efficiency despite impressive relative figures.
Question 5: During a BMAT physics scenario, a ball is thrown horizontally from a cliff. Ignoring air resistance, what happens to its horizontal velocity over time?
- It decreases due to gravity
- It increases proportionally to time
- It remains constant throughout the flight (Correct answer)
- It becomes zero at the highest point
Correct answer: It remains constant throughout the flight
In projectile motion without air resistance, no horizontal force acts on the ball, so horizontal velocity remains constant.
Question 6: A GP notices that patients from lower socioeconomic backgrounds attend fewer cancer screening appointments. Which intervention best addresses the root cause?
- Increase the frequency of reminder letters only
- Address structural barriers such as transport, flexible appointment times, and health literacy (Correct answer)
- Penalize non-attendance by removing patients from the list
- Assume these patients have lower cancer risk
Correct answer: Address structural barriers such as transport, flexible appointment times, and health literacy
Health inequalities in screening uptake are driven by structural and social determinants, requiring systemic rather than superficial interventions.
Question 7: In a chemistry case, 0.1 mol of sodium hydroxide is dissolved in enough water to make 500 mL of solution. What is the pH?
- 12
- 13 (Correct answer)
- 11
- 14
Correct answer: 13
Concentration = 0.1/0.5 = 0.2 mol/L; pOH = -log(0.2) ≈ 0.7; pH = 14 - 0.7 = 13.3, which rounds to 13.
BMAT Case Studies & Practical Application 2
A researcher notices that a drug trial shows a statistically significant result (p=0.04) but the effect size is very small.
What is the most appropriate conclusion?