FT IR SPECTROSCOPY QUIZ

Folding

Molecular mass

Isoelectric point

Solubility

8.5

10.05

7.5

11.05

identification of the -COOH terminal amino acids

identification of the -NH2 terminal amino acids

All of these

partial cleavage of the original polypeptide into smaller polypeptides

2

6

3

4

Spin - spin relaxation

None of these

Spin - spin - spin relaxation

Spin - lattice relaxation

None of these

That the detector rotates around the sample

That the sample is spun rapidly in the applied field

If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space

The processional frequency of the nucleus increases

The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field

None of these

The nucleus spins faster

None of these

To ensure that all target nuclei in the sample have been excited

To increase sensitivity

To remove inaccuracies caused by fluctuations in the applied magnetic field

By radio-frequency radiation whose frequency is swept across a predetermined range

By an intense pulse of radiation which contains a wide range of frequencies

By an intense pressure

None of these

a specimen is fixed and then coated with thin layer of a heavy metal

None of these

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