AAMC Sample test

Question 1

How do you find the stereoisomers there are of a compound?

Answer 1

By counting the chirality centers and raising 2 to that number.

Question 2

By definition a compound precipitates when the solubility constant Ksp is?

Answer 2

Lower than the compound
Compound>Ksp : precipitate

Compound

Question 3

One function of the myelin sheat is to?

Answer 3

Insulate the axon from its surroundings allowing depolarization to to be transmitted along the axon.

Question 4

To calculate the current what do you need to do?

Answer 4

Find V and R.
R is resistant per unit length and length.

V is potential

Question 5

What is the concentration of Cl- ions in 0.1 M solution of calcium chloride.

Answer 5

CaCl2 so Cl would be 0.2M

Question 6

In RP-HPLC, which compound will elute first?

Answer 6

In RP-HPLC, the most polar compound will elute first.

Question 7

In order to image the motion of a fetus what minimal information does the device require?

Answer 7

It requires the speed of the sound, and the frequencies of the sound waves emitted and observed.

Question 8

The principal quantum number refers to?

Answer 8

The approximate radial size of an electron cloud.

Question 9

Atomic orbitals

Answer 9

Approximate shape of an electron cloud.

Question 10

If a binding site recognize anionic substrates?

Answer 10

The amino acid that directs it there has a positively charged side chain.

Question 11

Temperature and resistance are …related. And charge and Resistance are …related.

Answer 11

Directly for T and R

Inversely for I and R

R and T are directly linearly related.

Question 12

If the temperature is increased the charge is?

Answer 12

DECREASED

Question 13

What is one method to isolate polypeptides and proteins from aqueous extract?

Answer 13

Through freeze and drying by using sublimation under reduced pressure will keep the mixture cold and maintain the protein in its native state.

Question 14

The density of a human body according to archamides can be determine through which formula?

Answer 14

Wair/(Wair-Ww)

Question 15

The Doppler ultrasound technique has advantages in that?

Answer 15

It allows the measuring of the blood flow as well. The Doppler effect refers to how a sound wave emitted or reflected by a moving object will change its frequency relative to the speed of the object.

Question 16

Q= CTm

Answer 16

Q=CTm

Question 17

In oxidative phosphorylation cytochrome c acts as a?

Answer 17

1-electron carrier becuase cytochrome c is a hemeprotein that only cycles between ferrous a ferric state during OT, so only a single electron transfer are possible

Question 18

Which primers are most suitable for PCR?

Answer 18

The ones that are rich in G and C contents and have G and C pairs at the 5 prime or 3 prime end of them.

Question 19

In which phase does nondisjunction occur?

Answer 19

The failure of homologus chromosomes to separate happens during anaphase I. And the failure of sister chromosomes to separate during anaphase II of myosis.

Question 20

During ribosomal protein sysntehsis only .. amino acids are used?

Answer 20

L-amino acids

Question 21

Only … is in a loose conformation and readily accesible for transcription.

Answer 21

Only euchromatin is in a loose conformation and readily accesible for transcription. A gene that is always turned on and must be accesible to transcription factors is in euchromatin.

Question 22

Actin filaments are in?

Answer 22

Microfilaments

Question 23

Fatty acids contain a ?

Answer 23

Carboxylic acid head and hydrocarbon tail.

Question 24

Changing an amino acid from Alanine to proline will result in?

Answer 24

Proline disrupts alpha helices, which is a main component of secondary structures.