MCAT® Exam practice questions

248 free questions with answers and explanations.

201.A patient with a history of chronic pain is admitted for a new, acute injury. During their hospital stay, nurses notice that the patient frequently reports pain levels of '10/10' even for minor discomforts, and often requests strong opioid medications. Family members report that the patient often exaggerates symptoms at home to gain attention. This behavior is most consistent with which of the following psychological concepts?Psychological, Social, and Biological Foundations of Behavior
202.A sociologist observes a family where the parents, despite working long hours at low-wage jobs, emphasize the importance of education and hard work to their children, believing that upward mobility is achievable through individual effort. However, the children attend underfunded schools and lack access to resources that would support their academic success. This situation best illustrates the concept of:Psychological, Social, and Biological Foundations of Behavior
203.A researcher conducts an experiment where participants are asked to identify a target letter (e.g., 'X') embedded within a string of other letters. In one condition, the target letter is presented alone (e.g., 'X'). In another condition, the target letter is presented within a string of identical letters (e.g., 'XXXXX'). In a third condition, the target letter is presented within a string of different letters (e.g., 'ABCXD'). If participants are generally faster at identifying the target in the 'XXXXX' condition compared to the 'ABCXD' condition, this phenomenon is best explained by which of the following perceptual processes?Psychological, Social, and Biological Foundations of Behavior
204.A researcher is studying the effects of a new medication on memory recall. They administer the medication to one group of participants and a placebo to another group. After a set period, they test both groups on their ability to recall a list of words. The 'list of words' used in the recall test represents which of the following components of the experimental design?Psychological, Social, and Biological Foundations of Behavior
205.A patient with a history of stroke presents with visual agnosia, specifically an inability to recognize faces (prosopagnosia), despite having intact visual acuity and no general intellectual impairment. Damage to which of the following brain regions is most likely responsible for this specific deficit?Psychological, Social, and Biological Foundations of Behavior
206.A cognitive psychologist conducts an experiment where participants are briefly shown a series of common objects (e.g., a chair, a table, a lamp) and then immediately asked to recall them. They find that participants tend to remember the first few items and the last few items in the list more accurately than the items in the middle. This phenomenon is known as the:Psychological, Social, and Biological Foundations of Behavior
207.A patient arrives at the emergency room exhibiting sudden, severe symptoms including difficulty breathing, chest pain, dizziness, and a feeling of impending doom, despite no apparent medical cause. These symptoms rapidly subside after about 20 minutes. The patient reports similar episodes occurring unexpectedly over the past month. What psychological disorder is most consistent with these symptoms?Psychological, Social, and Biological Foundations of Behavior
208.A student is performing a calorimetry experiment to determine the enthalpy of neutralization for a reaction between a strong acid and a strong base. They mix 50.0 mL of 1.0 M HCl with 50.0 mL of 1.0 M NaOH in a coffee-cup calorimeter. The initial temperature of both solutions is 22.0 °C, and the final temperature of the mixture is 28.7 °C. Assuming the density of the solution is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/g·°C, what is the molar enthalpy of neutralization (ΔH_neut) for this reaction? (Assume negligible heat capacity of the calorimeter).Chemical and Physical Foundations of Biological Systems
209.A sociologist observes a small, isolated community that has maintained its traditional customs, language, and social structures for centuries, despite being geographically located within a larger, modern nation-state. The community members exhibit strong ingroup loyalty and resist external influences. This situation is an example of what type of social organization?Psychological, Social, and Biological Foundations of Behavior
210.An elderly patient with widespread cerebral atrophy is evaluated for cognitive decline. Neuropsychological testing reveals significant deficits in executive functions, including planning, problem-solving, and working memory, but relatively preserved long-term memory for remote events and procedural skills. This pattern of cognitive impairment is most characteristic of damage to which of the following brain regions?Psychological, Social, and Biological Foundations of Behavior
211.A student is investigating the properties of a hypothetical element, 'X', which has an electron configuration ending in 4d⁷. Based on its position in the periodic table, what is the most likely charge that element 'X' will form in its most common stable ion?Chemical and Physical Foundations of Biological Systems
212.A cognitive psychologist is studying how individuals perceive the completeness of shapes. Participants are shown a series of incomplete figures, such as a circle with a small gap or a square with one corner missing. Most participants report seeing the full, complete shapes despite the missing segments. This phenomenon is best explained by which Gestalt principle of perception?Psychological, Social, and Biological Foundations of Behavior
213.A student is asked to draw the most stable chair conformation of trans-1,4-dimethylcyclohexane. Which of the following descriptions accurately represents this conformation?Chemical and Physical Foundations of Biological Systems
214.A child is learning to ride a bicycle. Initially, they struggle to balance and coordinate pedaling. However, with consistent practice and parental guidance, they gradually master the skill. According to Vygotsky's sociocultural theory, the parental guidance provided during the learning process is an example of what concept?Psychological, Social, and Biological Foundations of Behavior
215.A patient reports experiencing vivid, dream-like hallucinations and delusions, along with disorganized speech and severely impaired social and occupational functioning. These symptoms have been present for six months and are not attributable to substance use or another medical condition. Which of the following diagnoses is most consistent with this presentation?Psychological, Social, and Biological Foundations of Behavior
216.A sociologist is analyzing data from a recent census in a developed country. They observe a trend where the birth rate has fallen below the replacement level, the death rate is low, and the proportion of the elderly population is significantly increasing, while the proportion of the young population is decreasing. This demographic shift is most characteristic of which stage of the demographic transition model?Psychological, Social, and Biological Foundations of Behavior
217.A research team is investigating the effects of a new stimulant medication on attention span. They administer the medication to one group of participants and a placebo to another group. Both groups then complete a standardized task designed to measure sustained attention. Which of the following best describes the role of the placebo in this study?Psychological, Social, and Biological Foundations of Behavior
218.A researcher conducts a study on the effects of sleep deprivation on cognitive performance. They randomly assign 100 participants to one of two groups: Group A sleeps for 4 hours per night, and Group B sleeps for 8 hours per night. After one week, all participants complete a series of cognitive tasks, and their scores are recorded. The researcher then calculates the average cognitive task score for each group and compares them. This study design is an example of a:Psychological, Social, and Biological Foundations of Behavior
219.A pharmaceutical company is developing a new drug that is a weak base. To optimize its absorption in the small intestine, which typically has a pH of 7.4, what characteristic of the drug would be most desirable?Chemical and Physical Foundations of Biological Systems
220.A group of researchers is studying a remote indigenous tribe that has minimal contact with the outside world. They observe that the tribe has a complex system of oral traditions, unique spiritual beliefs, and a distinct language that has been passed down through generations. These observations are most relevant to the study of which sociological concept?Psychological, Social, and Biological Foundations of Behavior
221.A patient with damage to their Broca's area due to a stroke presents with a specific type of language deficit. They understand spoken and written language relatively well but struggle to produce fluent speech, often speaking in short, effortful phrases with many pauses and missing function words (e.g., 'Want food,' 'Go store'). This condition is best characterized as:Psychological, Social, and Biological Foundations of Behavior
222.A group of friends decides to go bungee jumping. While standing on the platform, they all experience intense physiological arousal: their hearts race, palms sweat, and breathing quickens. According to the Schachter-Singer two-factor theory of emotion, what is the next crucial step for these friends to experience the emotion of 'fear'?Psychological, Social, and Biological Foundations of Behavior
223.A hospital is implementing a new policy to reduce medical errors. They require all nurses to double-check medication dosages with another nurse before administering them to patients. This policy is designed to counteract which of the following cognitive biases that often contribute to errors?Psychological, Social, and Biological Foundations of Behavior
224.A chemist is performing a synthesis reaction in which an alcohol is treated with a strong oxidizing agent, producing a carboxylic acid. Which of the following reagents is most likely being used for this transformation?Chemical and Physical Foundations of Biological Systems
225.A student is analyzing the behavior of light as it passes from air into a block of glass. They observe that the light ray bends towards the normal. Which of the following statements best explains this phenomenon?Chemical and Physical Foundations of Biological Systems
226.A patient presents with persistent feelings of sadness, anhedonia, significant weight loss, insomnia, and fatigue for the past three weeks. Psychiatric evaluation notes a history of similar episodes. These symptoms are primarily indicative of a dysfunction in which of the following neural circuits?Psychological, Social, and Biological Foundations of Behavior
227.A group of friends is debating the merits of a new local ordinance. Initially, they hold a range of opinions. After an hour of discussion, however, their collective stance becomes much more extreme than any individual's initial view. Which of the following psychological phenomena best describes this outcome?Critical Analysis and Reasoning Skills
228.A social media company is designing a new algorithm to curate content for its users. One team proposes an algorithm that prioritizes content based on what users have previously engaged with, reinforcing their existing viewpoints and preferences. A critic argues that this approach risks creating 'echo chambers' and limiting users' exposure to diverse perspectives. This criticism is primarily concerned with the algorithm's potential to exacerbate which cognitive phenomenon?Critical Analysis and Reasoning Skills
229.A medical physicist is designing a new imaging device that requires a strong, uniform magnetic field. Which of the following configurations would be most suitable for generating such a field?Chemical and Physical Foundations of Biological Systems
230.A laboratory technician is preparing a buffer solution. They combine 0.10 mol of a weak acid (HA) with 0.10 mol of its conjugate base (A-) in 1.0 L of water. If the pKa of the weak acid is 4.75, what is the pH of the resulting buffer solution?Chemical and Physical Foundations of Biological Systems
231.A student is investigating the concept of entropy in thermodynamics. Which of the following processes would result in a decrease in the entropy of the system?Chemical and Physical Foundations of Biological Systems
232.A researcher conducts an experiment where participants are shown a series of images, each depicting a different object. They are then asked to recall as many objects as possible. The researcher observes that participants tend to remember the first few objects and the last few objects shown, but struggle with objects in the middle. This phenomenon is best explained by which of the following?Psychological, Social, and Biological Foundations of Behavior
233.A student is analyzing the electron configuration of various elements. Which of the following elements has the greatest number of unpaired electrons in its ground state?Chemical and Physical Foundations of Biological Systems
234.A chemist is attempting to synthesize a chiral molecule. Which of the following conditions is absolutely necessary for a molecule to be considered chiral?Chemical and Physical Foundations of Biological Systems
235.A historian is analyzing primary sources from the American Civil War. They notice that many accounts from both Union and Confederate soldiers, despite their starkly different political allegiances and objectives, frequently invoke universal concepts such as 'honor,' 'duty,' and 'sacrifice' to justify their actions and motivations. Which ethical perspective is best exemplified by the historian's observation regarding these shared moral appeals?Critical Analysis and Reasoning Skills
236.A philosopher argues that ethical truths are not absolute or universally applicable, but rather are relative to particular cultures, historical periods, or individual perspectives. Therefore, what is considered 'right' or 'wrong' can vary significantly across different contexts. This philosophical stance is known as:Critical Analysis and Reasoning Skills
237.A participant in a psychological experiment is asked to recall a list of 20 unrelated words. They find it easiest to remember the first few words and the last few words on the list, while the words in the middle are much harder to recall. This phenomenon is best explained by which of the following?Critical Analysis and Reasoning Skills
238.An organic chemist is preparing to synthesize a Grignard reagent. Which of the following conditions is most crucial to ensure a successful reaction and prevent undesirable side reactions?Chemical and Physical Foundations of Biological Systems
239.A patient with a chronic illness is presented with two treatment options. The first option is a standard, well-established therapy with a 70% success rate. The second option is an experimental therapy with a 30% failure rate. Although the success rates are mathematically identical, the patient opts for the first treatment, stating they prefer to focus on the 'success' rather than 'failure'. This decision-making pattern illustrates which cognitive bias?Critical Analysis and Reasoning Skills
240.A biochemist is analyzing the structure of a novel protein. They observe that the protein contains several cysteine residues that form disulfide bonds. Which of the following levels of protein structure is directly stabilized by these disulfide bonds?Chemical and Physical Foundations of Biological Systems
241.A team of researchers is developing a new diagnostic test for a rare genetic disorder. They conduct initial trials and find that the test correctly identifies individuals with the disorder 98% of the time. However, it also incorrectly identifies individuals without the disorder as having it 5% of the time. In this context, the 98% represents which of the following measures of diagnostic accuracy?Critical Analysis and Reasoning Skills
242.A manager is reviewing an employee's performance over the past year. Although the employee's overall performance was consistently good, a recent minor mistake made by the employee looms large in the manager's mind, disproportionately influencing the final performance rating downwards. Which cognitive bias is the manager most likely exhibiting?Critical Analysis and Reasoning Skills
243.A city council is debating whether to fund a new public park. One council member argues that while there hasn't been a vocal public demand for a park, building it could reveal a significant, unspoken desire for green spaces, which residents might not have articulated because they didn't believe it was an option. This argument appeals to the concept of:Critical Analysis and Reasoning Skills
244.A community outreach program aims to reduce littering by placing prominent signs that say, '9 out of 10 people in this neighborhood dispose of their trash properly.' This strategy is based on the idea that individuals are more likely to conform to a behavior if they believe it is widely practiced by others. This approach leverages which social psychological principle?Critical Analysis and Reasoning Skills
245.A historian is analyzing primary sources from the American Civil War. They notice that many soldiers, despite facing horrific conditions and high mortality rates, expressed strong moral justifications for their cause, often rooted in universal principles of freedom or duty. This approach to understanding morality, where certain ethical truths are considered absolute and universally applicable, aligns with which philosophical concept?Critical Analysis and Reasoning Skills
246.A medical researcher is conducting a study to evaluate the effectiveness of a new pain medication. To ensure the results are unbiased, neither the patients nor the administering nurses know who is receiving the actual drug and who is receiving a placebo. This experimental design is an example of which of the following?Critical Analysis and Reasoning Skills
247.A student is performing a collision experiment on a frictionless surface. A 2.0 kg cart moving at 3.0 m/s collides with a stationary 4.0 kg cart. After the collision, the 2.0 kg cart rebounds with a speed of 1.0 m/s in the opposite direction. What is the speed of the 4.0 kg cart after the collision?Chemical and Physical Foundations of Biological Systems
248.A financial advisor is discussing investment strategies with a client. The client, having recently seen several news reports about a few highly successful tech startups, is convinced that investing heavily in similar startups is a surefire way to get rich quickly, despite the advisor's warnings about the high failure rate of new businesses. Which cognitive bias is the client most likely exhibiting?Critical Analysis and Reasoning Skills