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. In the human ear, sound waves cause fluid in the cochlea to… — Which cells are responsible for converting thes
2. An electrophysiologist observes a neuron at its resting memb… — Which ion is primarily responsible for this de
3. Which organelle would you expect to be exceptionally well-developed in these cells?
4. What genetic term describes a single gene influencing multiple seemingly unrelated traits?
5. Which structure is most likely dysfunctional?
6. A researcher discovers that a population of bacteria survives exposure to an antibiotic because a few individu
7. A patient is admitted to the emergency department with a sev… — How does this patient's O_2 saturation at a ti
8. Which molecule acts as a 'fluidity buffer' in animal cell membranes?
9. A researcher is studying two genes that are located very close to each other on the same chromosome. They noti
10. A protein signal binding to a cell surface receptor leads to… — What is the expected outcome of this activatio
11. Which observation correctly explains the different O_2 binding behaviors?
12. A sprinter finishes a 400-meter dash and has an accumulation… — Which statement best describes the Bohr effect
13. A test cross is performed by mating an individual of dominant phenotype but unknown genotype with an individua
14. What is the expected position of their oxygen-hemoglobin dissociation curve relative to the standard?
15. Which equation correctly illustrates the chemical basis for the 'acid' component of this shift?
16. A patient with severe dehydration is likely to exhibit which of the following physiological responses to maint
17. A scientist is tracking the movement of a secreted protein. If the protein has just left the 'trans' face of t
18. A population of flowers is in Hardy-Weinberg equilibrium. Th… — What is the frequency of the dominant allele
19. Which of the following changes would result in a decrease in the P_50 value of hemoglobin?
20. In the lung alveoli, the P_CO_2 is relatively low and the pH… — How do these conditions facilitate the functio
21. Which of the following describes the immediate effect on the resting membrane potential of their neurons?
22. A molecule moves into a cell against its concentration gradient using energy provided by a pre-existing sodium
23. What is the frequency of the heterozygous genotype (2pq)?
24. During heavy exercise, a cyclist's heart rate increases to 1… — How does this change the duration of the cardi
25. An athlete is sprinting a 100-meter dash. Which of the following best describes the metabolic fate of pyruvate
26. Which cellular change occurs in the collecting duct cells to restore homeostasis?
27. What is the osmolarity of the filtrate at the end of the PCT compared to the initial filtrate in Bowman's spac
28. What is the primary factor that makes the peptide bond unusually stable and prevents free rotation around the
29. What type of regulation is being demonstrated?
30. At a very low substrate concentration of 0.1 mM, which enzyme will produce product more rapidly?