Section bank Physics And Chem Flashcards
How do you calculate the magnitude of an electric field? The passage says 4.5kV at a distance of 0.5m.
The intensity of a uniform electric field E is related to the voltage V divided by the distance d from which it applied. 4.5kV/0.5m = 9kV/m
Benzene -1,4-diol can be made into 2,5- dihydroxybenzoic acid by what process?
By carboxylation. Notice that the numbering changes because of the importance of the carboxylic acid. And that the numbering starts from the alpha carbon.
The MALDI-MS technique allows the separation through which feature?
The velocity is inversely related to the ion mass-to-charge ratio. The fastest ion are those with the smallest m/z ratio, these arrive first at the MS detector.
The value of the electromagnetic energy delivered during one pulse can be calculated by?
Multiplying the W by the seconds to give you the answer in Joules. This is because Watts equals Joules/Seconds.
During a form of finger printing proteolytic cleavage happens, what type of reaction is that?
It is a hydrolysis reaction.
The photoacoustic Calorimetry (PAC) and the classic calorimetry based on thermometers in that?
It enables the measurement of fast and localized heat transfer process.
What is the reading of the energy when an appropriate laser is used in an photoacoustic calorimeter?
Based on the energy conservation, if the appropriate laser is use, the reading of the energy meter would be equal to zero for a laser use to disassociate a particular chemical bond.
The photon energy is directly proportional to?
The photon energy is directly proportional to radiation frequency. The higher the frequency they higher the photon energy.
Based on the ray diagram shown, the focal length would be? The laser is 12cm away passing through a convex or converging lens and hitting a sample 4cm on the other side.
1/f= 1/12+1/4= 1/12+3/12= 4/12= 12/4=f F=3
Which extraction procedure will completely separate an amide from the by-product of the reaction between an anime and excess carboxylic acid anhydride?
Add 0.1 M NaOH to quench unreacted anhydride. Then add diethyl ether and separate the layers. The amide can be obtained from the ether layer by evaporating the solvent. The by-product of such reaction will be an acidic carboxylic acid and the excess unreacted material will also be acidic. Extraction with aqueous base will hydrolyze and extract both of these into the aqueous layer, leaving the neutral amide in the ether layer.
What are the SI prefix, standard forms, and symbols? For the scientific notation needed for the MCAT?
-12,-9,-6, -3, -2,-1 1, 2, 3,6,9, 12 ^ p, n, μ, m, c, d da, h, k, M, G, T
The time dependence of the potassium current through a cell membrane channel is subject to a constant of 80-mV. The Amps is 400•10^-12
Ohms law is I= V/R so R = 80•10^-3/ 400•10^-12 = 8•10^-2/4•10^-10 = 200MΩ
Make sure you know how phophatidyl cholines members of the phosphatides look like. And phosphatides as well.
Look them up
Liposomes can be difficult to?
Detect since they do not absorbe visible light and many molecules absorbe UV light. A experimental design that allows fluorescent due to be trapped inside during liposome formation is needed. They can then be detected using fluorescent spectroscopy.
How do you measure catalytic efficiency?
By examining the ratio of Kcat/Km the higher the value the more efficient the enzyme.
What does the behavior of liposomes labeled compound 1 and compound 2 if the results are stable when mixed and forms new liposomes when mixed tells you about them?
It means that compound 1 is under kinectic control whereas compound 2 is under thermodynamic control due to the fact that the latter achives its thermodynamically stable step more rapidly. The thermodynamic product is reversible thus it would mix to create the most homogenous and stable intermediate, whereas kinetic is irreversible!
What mass of the compound (MW= 800g/mol) is contained in the solution prepared liposomes that elute at 20mL by size-exclusion chromatography? The figure showing the elution profile shows that at 20mL the concentration was 10mL The passage also says that the compounds were synthesized from 1mL
0.10mM*1mL = 0.1 microL 0.1 microL *800g/mol = 80 microL
What is the electronic configuration of the Co(II) center found vitamin B12?
Co2+ is a dication formed by the loss of two electrons so the 4s2 are lost and the answer is [Ar]3d^7
which cation is most likely to be found place of Fe2+ in the square planar binding of hemoglobin?
Co2+ is closely related to Fe2+
The ATP-dependent phosphorylation of a protein target is catalyzed by which class of enzyme?
Kinases catalyze the transfer of phosphate groups from ATP to target proteins and are classified as transferases.
Which compounds are easily detected during experiments by bright colors?
The compounds with larger sets of conjugates double bonds.
nonpolar amino acids?
The nine amino acids that have hydrophobic side chains are glycine (Gly), alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile), proline (Pro), phenylalanine (Phe), methionine (Met), and tryptophan (Trp). Shown at the right is the structure of valine.
