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MDCAT 2026 Practice Paper: Mixed Subjects · MDCAT / Pre-Medical · 41 practice questions

1. A student is proofreading a report and must correct a sentence describing a single male colleague's completed task using present perfect tense. Which version is grammatically correct?

  1. AHe has completed the work.
  2. BHe have completed the work.
  3. CHe complete the work yesterday.
  4. DHe having completed the work.
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A. He has completed the work. With the singular subject 'he', the present perfect uses 'has' + past participle: 'has completed.'

2. A muscle biopsy from a patient with a suspected mitochondrial myopathy shows severely reduced oxidative phosphorylation activity, but glycolysis in the cytoplasm proceeds normally. Which cellular process would be most directly impaired by this defect, given the primary site of aerobic ATP production?

  1. ARibosomal protein synthesis
  2. BElectron transport chain-linked ATP synthesis
  3. CGolgi-mediated protein packaging
  4. DLysosomal digestion of debris
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B. Electron transport chain-linked ATP synthesis Mitochondria contain the electron transport chain and ATP synthase, making them the main site of aerobic ATP production; a defect here impairs oxidative phosphorylation specifically.

3. A cyclist travels 10 km in a curved path and ends up 6 km from the starting point in a specific direction. If asked only 'how fast' the cyclist was moving overall without regard to direction, which quantity is being requested?

  1. ASpeed
  2. BForce
  3. CDisplacement
  4. DVelocity
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A. Speed Speed has magnitude only, unlike velocity, displacement, and force which are vectors requiring direction.

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