bio-biochem — MCAT Practice Questions

231 free MCAT questions on bio-biochem: 87 easy, 117 medium, and 27 hard, every one exam-realistic and fully explained once you sign in. This is the fastest way to turn bio-biochem from a weakness into a scoring area — drill it in 10-question reps with immediate feedback.

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1. What genetic term describes a single gene influencing multiple seemingly unrelated traits?
2. In the human ear, sound waves cause fluid in the cochlea to… — Which cells are responsible for converting thes
3. An electrophysiologist observes a neuron at its resting memb… — Which ion is primarily responsible for this de
4. A researcher discovers that a population of bacteria survives exposure to an antibiotic because a few individu
5. Which structure is most likely dysfunctional?
6. Which organelle would you expect to be exceptionally well-developed in these cells?
7. Which molecule acts as a 'fluidity buffer' in animal cell membranes?
8. A scientist is tracking the movement of a secreted protein. If the protein has just left the 'trans' face of t
9. A molecule moves into a cell against its concentration gradi… — This process is best described as:
10. A protein signal binding to a cell surface receptor leads to… — What is the expected outcome of this activatio
11. A population of flowers is in Hardy-Weinberg equilibrium. Th… — What is the frequency of the dominant allele
12. What is the frequency of the heterozygous genotype (2pq)?
13. A researcher is studying two genes that are located very clo… — This phenomenon is known as:
14. A test cross is performed by mating an individual of dominant phenotype but unknown genotype with an individua
15. A patient is admitted to the emergency department with a sev… — How does this patient's O_2 saturation at a ti
16. Which observation correctly explains the different O_2 binding behaviors?
17. A sprinter finishes a 400-meter dash and has an accumulation… — Which statement best describes the Bohr effect
18. Which of the following changes would result in a decrease in the P_50 value of hemoglobin?
19. What is the expected position of their oxygen-hemoglobin dissociation curve relative to the standard?
20. In the lung alveoli, the P_CO_2 is relatively low and the pH… — How do these conditions facilitate the functio
21. Which equation correctly illustrates the chemical basis for the 'acid' component of this shift?
22. Which of the following describes the immediate effect on the resting membrane potential of their neurons?
23. A patient with severe dehydration is likely to exhibit which of the following physiological responses to maint
24. During heavy exercise, a cyclist's heart rate increases to 1… — How does this change the duration of the cardi
25. Which cellular change occurs in the collecting duct cells to restore homeostasis?
26. Which of the following sets of physiological changes is most likely to be observed?
27. What is the osmolarity of the filtrate at the end of the PCT compared to the initial filtrate in Bowman's spac
28. During a state of severe dehydration, which of the following describes the synergistic action of ADH and aldos
29. An athlete is sprinting a 100-meter dash. Which of the following best describes the metabolic fate of pyruvate
30. Assuming both are spherical, how does the surface-area-to-volume ratio change for the larger cell?