MCAT Question of the Day

Correct Answer: B. 10 m.

All of the kinetic energy will be transferred into potential energy at the maximum height of the cannonball. The trick is to not replace KE with (1/2)mv², the kinetic energy is already given! Therefore:

KE -> PE -> KE = PE -> KE = mgh -> h = KE/mg = 500 J / (5 kg)(10 N/kg) = 10 m.

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Correct Answer: D. The previous noble gas.

A metal prefers to lose electrons so that it has the configuration of 8 around its valence shell so that it is equivalent to the stable noble gas previous to it.

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Correct Answer: B. The cell will shrivel

For cells with a selectively permeable membrane, water will move from higher water concentrations to lower water concentrations. In this problem, the salt is too large to cross the membrane, so the salt concentration will remain the same. Since red blood cells have more water than the salt-water mixture, the water in the cell would leave to try to make the two environments isotonic. If water leaves the cell, the cell will eventually shrink.

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Correct Answer: A. 10^-5

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Correct Answer: B. Synapomorphies

Plesiomorphies are characteristics that are original in the organism. While apomorhic means “derived characteristic”, the prefix syn- alters the meaning to “shared derived characteristic.” Using the prefix aut- causes the meaning to change to “self-derived characteristic” implying that it isn’t shared by another group. Homoplasy or homoplastic characteristics are shared among groups, but weren’t derived from an ancestral source.

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Correct Answer: B. Allelopathy

Allelopathy is type of INTERFERENCE competition, where the establishment of other individuals who would compete for a mutual resource is prevented, in this case using a toxic chemical. Intraspecific competition occurs when competition occurs within the same species; in this case the plant is competing with all the other species of plants in the area.

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Correct Answer: D. Autoclave

The autoclave is the laboratory proven method for killing bacteria, fungi, and some viruses. It can reach temperatures of 121 °C and 2.7 atm, and the combined pressure and temperature are enough to kill the majority of existing pathogens. However, the autoclave cannot kill some species that are able to form heavy spores or protein coats, which include some viruses and fungi.

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Correct Answer: A. 20 N

There are two forces acting on the string. The buoyant force of the ball upward, the tension in the string downward, and the mass of the ball. Since the ball is stationary, these forces must cancel. Thus, T + w = B, which implies:

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Correct Answer: C. Part of the innate immune system comprised of plasma proteins synthesized primarily by hepatocytes.

The complement system is a clear example of innate immunity, being a form of host defense that is non-specific and does not adapt in response to antigens. However, there is evidence of cross-talk between the complement system and adaptive immunity. Similarly components of the complement system communicate with components of the inflammatory system and hematopoietic system. Nonetheless, complement system components are distinct from leukocytes and the components of the inflammatory system and are primarilysynthesized in the liver.

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Correct Answer: C. 10 mi*h^-1*s^-1

The formula for acceleration is velocity divided by time:

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