MCAT Question of the Day

For which of the gas-phase reactions below would delta S be expected to be negative?

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Photo attributed to vellutoblu.

Human blood types are most often examined in reference to the ABO gene locus. The I^A and I^B alleles are both dominant to the i allele. If blood from a type AB individual were donated to three individuals who were, respectively, types A, B and O, which of the recipients blood would agglutinate?

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A student wishes to find the solubility of PbCl2, whose K(sp) = 7 x 10^-29. Which equation should she solve to do so?

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The conversion of threonine to isoleucine is a five-step enzymatic pathway. The end product, isoleucine, fits into the allosteric site of the enzyme at step 1, preventing its normal function. This is an example of:

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Which of the following will NOT change the pressure in a closed vessel containing N2 gas?

I. Increasing the temperature
II. Replacing half the N2 molecules with helium atoms
III. Doubling the volume of the vessel

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What is the current in a 60-W light bulb operating at 120-V household voltage?

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Toluene will show peaks in its:

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Two point charges attract each other with a force of 3.6 x 10^-6 N when they are 3 m apart. What is the force if the distance is increased to 6 m?

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A variety of organs with similar functions among the vertebrates are thin, moist, highly vascular, and cover a relatively large surface area. These are necessary characteristics for an efficient:

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A ball is thrown vertically upward with an initial velocity of 40.0 meters per second. What will be its velocity after 2.00 seconds?

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Photo attributed to StuSteeger.