MCAT Misses Question Log

In gas-liquid chromatography, the first peak to emerge will be from the...

least polar, most volatile compound

The addition of a phosphate group is catalyzed by a(n):

transferase

What is the total number of fused rings present in a steroid?

4

atmospheric pressure

760 mmHg

True/false: substrates irreversibly bind to enzymes.

false

An oxidoreductase is LEAST likely to affect which level of protein structure?

primary

gentrification

process in which relatively affluent individuals move into a neighborhood that recently consisted of residents with moderate to low income

Hydrogen bonds can be found in which of the following levels of protein structure? primary secondary tertiary quaternary

secondary, tertiary, and quaternary

The index of refraction of a medium is equal to...

the ratio of the speed of light in vacuum to the speed of light in the medium

Gamma decay occurs when a nucleus emits: A. a photon. B. a proton. C. a neutron. D. an electron.

A. a photon.

In the chromatography of the reaction mixture, water absorbed on cellulose functioned as the stationary phase. What was the principal factor determining the migration of individual components in the sample? A.Hydrogen bonding B.Solute concentration C.Stationary phase concentration D.Thickness of paper

A.Hydrogen bonding

If adults performed the block tapping task as a measure of working memory capacity, they would most likely replicate sequences of what length correctly? A. 9 plus or minus 1 B. 7 plus or minus 2 C. 10 plus or minus 1 D. 16 plus or minus 2

B. 7 plus or minus 2

Each of the following equations shows the dissociation of an acid in water. Which of the reactions occurs to the LEAST extent? A. HCl + H2O → H3O+ + Cl− B. HPO42− + H2O → H3O+ + PO43− C. H2SO4 + H2O → H3O+ + HSO4− D. H3PO4 + H2O → H3O+ + H2PO4−

B. HPO42− + H2O → H3O+ + PO43− (HPO42- has a high negative charge and so dissociation of it will occur to the least extent)

How will the rate of a catalyzed reaction be affected if the solid catalyst is finely ground before it is added to the reaction mixture? A. The rate will be faster because a greater mass of catalyst will be present. B. The rate will be faster because a greater surface area of catalyst will be exposed. C. The rate will be slower because the fine catalyst particles will interfere with product formation. D. The rate will remain the same because the mass of catalyst will be the same.

B. The rate will be faster because a greater surface area of catalyst will be exposed.

The term "ideal gas" refers to a gas for which certain assumptions have been made. Which of the following is such an assumption? A. The law PV = nRT2 is strictly obeyed. B. Intermolecular molecular forces are infinitely large. C. Individual molecular volume and intermolecular forces are negligible. D. One gram-mole occupies a volume of 22.4 L at 25°C and one atmosphere pressure.

C. Individual molecular volume and intermolecular forces are negligible.

Why is the velocity of blood flow slower in capillaries than in arteries? A. Capillary walls are more elastic than arterial walls. B. Capillaries have less resistance to blood flow than arteries. C. The total cross-sectional area of capillaries exceeds that of arteries. D. Blood pressure is higher in the capillaries than in arteries.

C. The total cross-sectional area of capillaries exceeds that of arteries.

radioactive decay equation/law

N(t) = N (1/2)^t/T

Pepsin, a hydrolase, cleaves peptides to produce...

an amine and a carboxylic acid

primacy effect

better memory for events at the beginning of the series

Ohm's law

current through a conductor between two points is directly proportional to the voltage across the two points; V (voltage)= I (current) x R (resistance)

What is an Rf value?

distance moved by compound/distance moved by solvent front

The intensity of the radiation emitted by the oxygen sensor is directly proportional to the:

number of photons emitted.