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MCAT Biology Question — Aldosterone

April 22, 2014

Aldosterone acts on the kidney by:

 

  1. increasing water permeability of the collecting duct
  2. increasing water permeability of the ascending limb of the loop of Henle
  3. increasing water permeability in the proximal tubule
  4. increasing sodium absorption and potassium secretion in the distal tubule

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MCAT Chemistry Question — Nitrous Oxide

April 21, 2014

Amateur chemists make nitrous oxide at home using this (unbalanced) reaction:

chemical reaction

How many grams of NH4NO3 are required to produce 134.4 L of mixed gas if products are at STP?

(Do NOT heat the ammonium nitrate above 240°C or it may detonate)

 

  1. 160
  2. 240
  3. 960
  4. 1440

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MCAT Chemistry Question

April 18, 2014

What is the effect of adding KNO3 to a saturated aqueous solution of KCl?

 

  1. Ksp increases because more K+ ions are present.
  2. Ksp decreases because NO3- ions displace Cl- ions.
  3. The concentration of Cl- ions decreases because KNO3 addition drives KCl dissociation towards the solid, undissociated form.
  4. More KCl dissolves because more aqueous K+ ions require more Cl- ions.

 

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MCAT Physics Question — Absolute Pressure

April 17, 2014

What is the ratio of the ratio of the absolute pressure at point A compared to point B if the open container shown below is filled with water?

 

absolute pressure physics question

 

A. Pb = 2Pa

B. Pb = 3Pa

C. Pb = 4Pa

D. Pb = 5Pa

 

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MCAT Biology Question — Virus vs. Bacterium

April 16, 2014

An infectious agent is probably a virus instead of a bacterium if it:

 

  1. Lacks membrane-bound organelles
  2. Cannot reproduce in acellular culture
  3. Has a length of 1μm, about the size of a mitochondrion
  4. Contains DNA

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MCAT Chemistry Question — Negative Slope

April 15, 2014

Which of the following best accounts for the negative slope of the liquid-solid equilibrium line in the phase diagram for water?

 

  1. H2O(s) has a greater density than H2O(l), which causes the solid to form liquid under high pressure conditions.
  2. H2O(s) has a greater density than H2O(l), which results from the hydrogen bonds formed between water molecules.
  3. H2O(s) has a lower density than H2O(l) which results from the crystalline framework that forms due to hydrogen bonds.
  4. H2O(s) has a lower density than H2O(l) which causes the solid to form liquid under low pressure conditions.

 

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MCAT Biology Question — Behavior Science

April 14, 2014

Immediately after hatching, precocial birds, such as ducks or geese, are born with open eyes and the ability to walk. The hatchlings follow the first thing they see, which is typically their parent. A behavioral scientist studying this phenomenon observes the birth of a precocial bird, which immediately began to follow the scientist. Which of the following concepts best describes this behavior?

 

  1. Conditioning
  2. Imprinting
  3. Innate inheritance
  4. Parental misrecognition

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MCAT Chemistry Question — Gas Behavior

April 11, 2014

The behavior of gas will deviate from ideal behaviors LEAST under which of the following sets of conditions:

 

  1. A gas at high pressure and temperature
  2. A gas at low pressure and temperature
  3. A gas at high pressure and low temperature
  4. A gas at low pressure and high temperature

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MCAT Biology Question — Cell Size

April 10, 2014

The size of a cell is least dependent on which of the following?

 

  1. Intracellular solute concentration
  2. Surface area to volume ratio
  3. Resting membrane potential
  4. Extracellular solute concentration

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MCAT Physics Question — Projectile Motion

April 9, 2014

Which of the following accurately compares the final velocity (vf) and acceleration (af) of an object as it strikes the ground after being launched with a velocity (v) from a platform 10 meters above than the striking surface?

 

  1. |af| > |a| and |vf| > |v|
  2. |af| < |a| and |vf| < |v|
  3. |af| = |a| and |vf| > |v|
  4. |af| = |a| and |vf| < |v|

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