Medium MCAT Practice Questions

419 free medium-difficulty MCAT questions, drawn live from KomFi's calibrated bank. The exam backbone: the difficulty band where most scoring happens.

1. A molecule moves into a cell against its concentration gradient using energy provided by a pre-existing sodium
2. A researcher is studying two genes that are located very close to each other on the same chromosome. They noti
3. A patient is admitted to the emergency department with a sev… — How does this patient's O_2 saturation at a ti
4. A sprinter finishes a 400-meter dash and has an accumulation… — Which statement best describes the Bohr effect
5. Which of the following changes would result in a decrease in the P_50 value of hemoglobin?
6. What is the expected position of their oxygen-hemoglobin dissociation curve relative to the standard?
7. In the lung alveoli, the P_CO_2 is relatively low and the pH… — How do these conditions facilitate the functio
8. Which equation correctly illustrates the chemical basis for the 'acid' component of this shift?
9. Which of the following describes the immediate effect on the resting membrane potential of their neurons?
10. A patient with severe dehydration is likely to exhibit which of the following physiological responses to maint
11. During heavy exercise, a cyclist's heart rate increases to 1… — How does this change the duration of the cardi
12. Which of the following sets of physiological changes is most likely to be observed?
13. What is the osmolarity of the filtrate at the end of the PCT compared to the initial filtrate in Bowman's spac
14. Assuming both are spherical, how does the surface-area-to-volume ratio change for the larger cell?
15. What is the primary factor that makes the peptide bond unusually stable and prevents free rotation around the
16. At a very low substrate concentration of 0.1 mM, which enzyme will produce product more rapidly?
17. A patient ingests a large amount of methanol. In the emergen… — What is the pharmacological rationale for this
18. What is the most likely structural consequence for the resulting polypeptide?
19. What is the primary purpose of converting pyruvate to lactate in this context?
20. Which renal mechanism has been overwhelmed?
21. A researcher observes that a protein denatures when exposed… — Which of the following bonds was NOT broken dur
22. What is the approximate frequency of asymptomatic carriers in this population?
23. A researcher is studying two solutions of DNA. Solution A has a higher percentage of G-C base pairs than Solut
24. Which of the following describes the secondary active transport of glucose in the intestinal lining?
25. If a researcher adds a reversible inhibitor that increases the apparent K_M but leaves the V_max unchanged, wh
26. Which mechanism explains the resulting polyuria (excessive urination)?
27. In a population of 1,000 rabbits that is in Hardy-Weinberg e… — How many rabbits in this population are expect
28. What is the osmotic consequence in the collecting duct?
29. What is the primary role of fermentation in human muscle cells during high-intensity anaerobic exercise?
30. How will the x-intercept of the Lineweaver-Burk plot change compared to the uninhibited sample?

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