AAMC Sample test Flashcards
How do you find the stereoisomers there are of a compound?
By counting the chirality centers and raising 2 to that number.
By definition a compound precipitates when the solubility constant Ksp is?
Lower than the compound
Compound>Ksp : precipitate
Compound
One function of the myelin sheat is to?
Insulate the axon from its surroundings allowing depolarization to to be transmitted along the axon.
To calculate the current what do you need to do?
Find V and R.
R is resistant per unit length and length.
V is potential
What is the concentration of Cl- ions in 0.1 M solution of calcium chloride.
CaCl2 so Cl would be 0.2M
In RP-HPLC, which compound will elute first?
In RP-HPLC, the most polar compound will elute first.
In order to image the motion of a fetus what minimal information does the device require?
It requires the speed of the sound, and the frequencies of the sound waves emitted and observed.
The principal quantum number refers to?
The approximate radial size of an electron cloud.
Atomic orbitals
Approximate shape of an electron cloud.
If a binding site recognize anionic substrates?
The amino acid that directs it there has a positively charged side chain.
Temperature and resistance are …related. And charge and Resistance are …related.
Directly for T and R
Inversely for I and R
R and T are directly linearly related.
If the temperature is increased the charge is?
DECREASED
What is one method to isolate polypeptides and proteins from aqueous extract?
Through freeze and drying by using sublimation under reduced pressure will keep the mixture cold and maintain the protein in its native state.
The density of a human body according to archamides can be determine through which formula?
Wair/(Wair-Ww)
The Doppler ultrasound technique has advantages in that?
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.
Q= CTm
Q=CTm
In oxidative phosphorylation cytochrome c acts as a?
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
Which primers are most suitable for PCR?
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.
In which phase does nondisjunction occur?
The failure of homologus chromosomes to separate happens during anaphase I. And the failure of sister chromosomes to separate during anaphase II of myosis.
During ribosomal protein sysntehsis only .. amino acids are used?
L-amino acids
Only … is in a loose conformation and readily accesible for transcription.
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.
Actin filaments are in?
Microfilaments
Fatty acids contain a ?
Carboxylic acid head and hydrocarbon tail.
Changing an amino acid from Alanine to proline will result in?
Proline disrupts alpha helices, which is a main component of secondary structures.
