MCAT Question of the Day

Correct Answer: C. 141 V.

By definition, Vrms = Vmax / sqrt(2). Therefore, Vmax = sqrt(2)*Vrms = (1.41)(100V) = 141 V.

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Correct Answer: A. I only.

ATP is the only product formed in both glycolysis and the ETC. Item II is false: NADH is produced only in glycolysis, and it is used in the ETC. Items III and IV are false: oxygen and FADH2 are not produced in either of these processes.

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Correct Answer: D. [Ar] 3d9 4p1

The ground state for Cu is [Ar] 4s1 3d10. Transition metals always lose their valence s electrons before any d electrons, so the ground-state electron configuration for Cu⁺ [(I) means +1] is [Ar] 3d10. The only excited configuration for Cu⁺ must be [Ar] 3d9 4p1. An alternate strategy is to look at the number of electrons, as Cu⁺ has 28, and this helps eliminate A and C as they do not have 28 electrons.

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Correct Answer: B. 0.5 m.

Once the ninja star comes to rest at the end of the spring, the upward force by the spring must balance the downward force of gravity. That is, kx = mg. Solving for x yields x = mg/k (1)(10)/(20) = 0.5 m.

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Correct Answer: B. The energy of the activated complex will decrease, and the reaction rate will increase.

A catalyst lowers the activation energy of a reaction, causing an increase in the reaction rate.

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Correct Answer: D. The acceleration is not zero and is always directed toward the center of the path.

Choice A is false because the object’s direction of motion is always changing, and choice B is false because the velocity is not constant. The acceleration, termed centripetal, points toward the center of the circular path.

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Correct Answer: D. A need to maintain their tissues in a hypoosmotic state.

Different organisms have different needs to maintain their water balance, depending on the environment they live in. Bony fish living in saltwater maintain hypoosmotic body fluids. The hyperosmotic water they live in tends to draw the water out of their body by osmosis. They can obtain water by ingesting ocean water, but this raises their internal osmolarity. They excrete salt, then, to lower their internal osmolarity.

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Correct Answer: B. F

Since the GameCube is totally submerged at both depths, the buoyant force, B = pVg, is the same at both depths.

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Correct Answer: B. KE = (1/2)mv²

The rate of expansion (or diffusion) is directly proportional to the mean velocity of the gas molecules. The only equation that has a term for velocity is the one in choice B.

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Correct Answer: B. Erythrocytes.

Erythrocytes (or red blood cells) do not contain a nucleus and thus contains no DNA. This is to maximize the amount of O2 an erythrocyte can carry.

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