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Free Test Prep MCAT Exam Questions

Absolute Free MCAT Exam Practice for Comprehensive Preparation 

  • Test Prep MCAT Exam Questions
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  • Exam: Medical College Admission Test: Verbal Reasoning, Biological Sciences, Physical Sciences, Writing Sample
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  • Updated On: Sep 04, 2026
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  • Question 1
    • MCAT-part-3-page300-image60
      A Hertzsprung - Russel diagram illustrates the different stages in a star’s life cycle. Stars evolve along the main
      sequence, increasing in surface temperature. After the main sequence stage, a star cools and expands. Using
      the diagram, which stage would you expect to come directly after the main sequence?

      Section: Physical Sciences 

      Answer: A
  • Question 2
    • …From a geological point of view, the Mediterranean is a tectonically mobile land-enclosed depression – small
      (about 3,000,000 square kilometers) in comparison to the major world oceans…Immediately obvious on all
      charts is the highly variable topography and relief of both the seafloor and adjacent borderland. The coastline is
      highly irregular and continental shelves, though generally narrow, are well developed off the major river deltas
      (Nile, Rhone, Po, and Ebro). Moreover, the deep-sea basins and trenches have distinctive relief, with basin
      plains ranging in depth from less than 1,000 meters to more than 4,000…Observation that rocks dredged
      offshore are similar to those on land raised a fundamental concept – the key to understanding Mediterranean
      history lies in the adjacent emerged land masses, and vice-versa…
      …Early paleographic reconstructions showed that the once-open communication with the Atlantic deteriorated
      during the upper Miocene. Water-mass exchange continued for a while in the Rif Strait, but then ceased
      completely prior to the beginning of the Pliocene…
      …High relief near what is now the Strait of Gibraltar served as a barrier to the exchange of waters with the
      Atlantic. Exposed to a hot and dry climate, water evaporated and the then-dry basin elicited comparison with a
      gigantic Death Valley…Microfossil studies suggested that the depth of the Mediterranean basin at these times
      had been “deep.” Estimates suggested a dry seafloor as far as 2,000 meters below ocean level… As a
      response to suddenly lowered sea level, rivers feeding the Mediterranean and canyons on the now-dry seafloor
      began a geologically dramatic phase of erosion. Deep, Grand Canyon-like gorges of the Nile and Rhone rivers,
      presently buried on land, were apparently cut during a great drawdown of water – when the Mediterranean floor
      lay exposed 1,000 meters or more below its present level…The sudden flooding through a gigantic waterfall at
      Gibraltar drowned the exposed basin floor. These falls would have been 1,000 times bigger than Niagara
      Falls…This flooding event is recorded by the Miocene Pliocene boundary, a time when open marine faunal
      assemblages were suddenly reintroduced from the Atlantic…
      …Geological theories usually fall at a glacial pace into a sea of controversy, and this one is no exception. Today
      – charging that proof for the theory is lacking – many scientists believe that the Med always contained saltwater,
      with only the depth of the seafloor and the water being in question… Some of the tenets on which the theory
      was formulated are, if not defective, very seriously in question. To interpret their findings, a respectable number
      of geologists studying the surrounding emerged borderland as well as subsea sections indicate that alternative,
      more comprehensive concepts must be envisioned…
      …It is not realistic to envision the Mediterranean seafloor of about 5 million years ago as a desert at 3,000
      meters below present ocean level. Several years ago…the Mediterranean [was compared] to a complex
      picture-puzzle that comprises numerous intricate pieces, many of which are already in place. A general image
      is emerging, although gaps in some areas of the picture remain fuzzy and indistinct.
      It can be inferred from the passage that geological theories tend to:

      Section: Verbal Reasoning 

      Answer: D
  • Question 3
    • The reaction R – Br + Br*– → R – Br* + Br – is always accompanied by inversion. If this reaction is carried out
      on an optically pure sample of a chiral compound, which of the following statements will be true? [Note: Br*
      represents a radioactive isotope of bromine.]

      Section: Biological Sciences 

      Answer: A
  • Question 4
    • Electromagnetic radiation from space constantly bombards the earth. Most wavelengths are absorbed by the
      atmosphere; however, there are two “windows” of nonabsorption through which significant amounts of radiation
      reach the ground. The first transmits ultraviolet and visible light, as well as infrared light or heat; the second
      transmits radio waves. As a result, terrestrial organisms have evolved a number of pigments that interact with
      light in various ways: some capture light energy, some provide protection from light-induced damage, and some
      serve camouflage or signaling purposes.
      Among these compounds are many conjugated polyenes, which play important roles as photoreceptors. For
      every chemical compound, there are certain wavelengths of light whose quanta possess exactly the correct
      amount of energy to raise electrons from their ground state to higher-energy orbitals. For most organic
      compounds, these wavelengths are in the UV range. However, conjugated double bond systems stabilize the
      electrons, so that they can be excited by lower-frequency photons with wavelengths in the visible spectrum.
      Such a pigment, known as a chromophore, will then transmit the “subtraction color,” a color complementary to
      the one absorbed. For instance, carotene, a hydrocarbon compound with eleven conjugated double bonds,
      absorbs blue light and transmits orange. The wavelength that is absorbed generally increases with the number
      of conjugated bonds; rings and side-chains also affect wavelength.
      MCAT-part-1-page303-image94
      Among the many biological molecules that are affected by light is DNA, the genetic material of living organisms.
      DNA absorbs ultraviolet light, and may be damaged by UVC (< 280 nm) and UVB (280-315 nm). UVA (315-400
      nm) and visible light can actually repair light-induced damage to DNA by a process called photorepair. For this
      reason, UVA, which also stimulates tanning, was once considered beneficial. However, there is now increasing
      evidence that UVA can damage skin.
      The color-producing quality of conjugated polyenes is attributable to:

      Section: Biological Sciences 

      Answer: B
  • Question 5
    • At a recent meeting of the American Public Transit Association, the Environmental Protection Agency unveiled
      stringent new standards for pollution control. The transit authorities were particularly concerned about the
      implementation of a proposed “Clean Air Act.” They believed the provisions of the Clean Air Act could severely
      affect basic services to their local communities. Many transit agencies were concerned that it would be difficult
      to comply with the pollution and emissions control standards while continuing to operate within realistic budgets.
      The aim of the Clean Air Act is to assure that by the year 2000, there will be a reduction of at least 10 million
      tons of sulfur dioxide from 1980 levels. The bill also calls for a reduction in pollutants that contribute to the
      depletion of ozone. Strict regulations of toxic air emissions would have to be established and enforced.
      Additionally, the Clean Air Act would establish specific acid-rain reduction quotas and enforce severe penalties
      for transgressors of any of the new clean air regulations.
      There is little doubt that mass-transit suppliers will be considerably affected by this new legislation, just as the
      chemical and petroleum industries have already been affected by similar legislation. Transit authorities are
      challenged to strike a difficult balance between complying with the government’s new standards and developing
      an official concern for the environment, while continuing to fulfill the transportation needs of the general
      population.
      Among the areas addressed by the Clean Air Act, the topic of mobile resources is of particular interest to mass
      transit authorities. Provisions contained in the Act under this title are aimed at encouraging the development
      and practical use of alternative fuel sources, like solar energy and methane fuel. The goal of this section of the
      Act is to eradicate toxic fuel emissions in order to provide cleaner air and a more favorable environment. The
      Act even goes so far as to declare that in cities like New York, Los Angeles and Houston – where air quality is
      particularly noxious and toxins exceed the limits of federal regulations – forms of mass transit should run on socalled “clean-burning fuels” by the year 2000. Such fuels include reformulated gasoline, propane, electricity,
      natural gas, ethanol, methanol, or any similar type of low-emission fuel. In addition, the Act proposes that, by
      1994, all new urban buses in cities with populations exceeding one million must operate solely on clean-burning
      fuels.
      The topics of alternative fuels and alternative fuel vehicles represent, by far, the most controversial issue in the
      Clean Air Act. President Bush has called alternative fuels “bold and innovative” means to control pollution, but
      according to many transportation experts, the Act’s proposals on alternative fuel usage are unrealistic. The
      transit authorities recognize that concern for the environment and health hazards like pollution are global
      issues. However, most transit officials concur that inventing and developing new ways to fuel mass transit will
      take at least 50 years to realize. They point out that the Act does not mention the political and social
      ramifications of usurping the role of the petroleum industries. The Act does not mention if or how the thousands
      of people employed by the oil industry will get retrained to produce and implement the use of “clean” fuel.
      No one disputes the fact that people need some form of transportation to get from place to place. Preserving
      the environment should be a priority, yet we need to remember that even if toxic emissions are completely
      eliminated sometime in the future, the challenge of moving mass numbers of people where they want to go will
      still exist and must remain a priority. Transit authorities contend that unless the Clean Air Act also
      acknowledges this, and develops a way to encourage mass transit over personal transportation, the problems
      of pollution might not be significantly altered. They suggest that there are many areas in this country that have
      little or no mass transit and that, if the Clean Air Act’s goal is to reduce pollution, perhaps the most practical and
      realistic means to achieve that goal is to encourage the development and maintenance of mass transit
      systems.
      The main goal of the “Mobile Resources” section of the Clean Air Act is to:

      Section: Verbal Reasoning

      Answer: A
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