What is the name given to the relaxation process due to an interaction between an excited nucleus and the magnetic fields caused by nuclei in molecules moving around in the sample? Spin - spin - spin relaxation Spin - lattice relaxation None of these Spin - spin relaxation TRUE ANSWER : ? YOUR ANSWER : ?
In scanning electron microscopy a specimen is not fixed and then coated with thin layer of a heavy metal a specimen is fixed and then coated with transition metal None of these a specimen is fixed and then coated with thin layer of a heavy metal TRUE ANSWER : ? YOUR ANSWER : ?
How do you turn a signal recorded in the time domain into a frequency domain signal? By use of a Michelson interferometer Fourier transformation Measurement of peak areas None of the above TRUE ANSWER : ? YOUR ANSWER : ?
In FT-NMR, how are nuclei excited? By an intense pressure By an intense pulse of radiation which contains a wide range of frequencies By radio-frequency radiation whose frequency is swept across a predetermined range None of these TRUE ANSWER : ? YOUR ANSWER : ?
The frequency of precession, the transition frequency and the Larmor frequency are different terms for the same frequency same terms for the same frequency same terms for the different frequency different terms for the different frequency TRUE ANSWER : ? YOUR ANSWER : ?
Negative staining is a technique used in immunocytochemistry light microscopy gel electrophoresis electron microscopy TRUE ANSWER : ? YOUR ANSWER : ?
The sequence of amino acids in proteins can be determined by means of All of these identification of the -NH2 terminal amino acids identification of the -COOH terminal amino acids partial cleavage of the original polypeptide into smaller polypeptides TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the basis of first dimension of separation for two-dimensional electrophoresis? Isoelectric point Folding Solubility Molecular mass TRUE ANSWER : ? YOUR ANSWER : ?
How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field? 6 3 4 2 TRUE ANSWER : ? YOUR ANSWER : ?