A)What is common to both EI and ESI? Choose one: a. They are both combined with quadrupole
Question:
A)What is common to both EI and ESI?
Choose one:
a. They are both combined with quadrupole analyzers
b. They are both combined to HPLC
c. They are both applied at atmospheric pressure
d. They are both soft ionization techniques
e. Gas-phase formation and ionization occur simultaneously in both
f. They are both hard ionization techniques
g. They are both applied under vacuum
h. They are both combined to GC
B) Which one of the following is the application of fluorescence spectroscopy?
I. High concentrations of protein-metal complexes in drugs
II. Determination of fluorescent impurities
III. Fluorescent drugs in low dose formulations
Choose one:
a. I and III
b. I and II
c. Only II
d. I, II and III
e. II and III
C) Mass spectrometry is combined with chromatography to separate the molecules in complex mixtures and then structurally characterize them by NMR.
Why hyphenated techniques of NMR with liquid chromatography is not widespread?
Choose one:
a. Pumping system of HPLC damages NMR
b. The magnetic field used in NMR causes fluctuations in NMR
c. The ion source requires conversion of the sample to the gas phase
d. Interfaces between NMR and chromatography destroy samples
e. D-labeled solvents used are expensive
f. NMR is not a continuous injection technique
D) What can not be said about the determination of ethinylestradiol in tablets using fluorescence spectroscopy?
Choose one:
a. Emission peak at 310 nm is due to fluorescence when excited with 285 nm
b. Interferences in Ethinyl estradiol in tablets absorb at UV Vis region
c. Fluorescence emission spectrum demonstrates two peaks when excited with 285 nm
D. Emission peak at 285 nm is due to scattering when excited with 285 nm
e. Ethinylestradiol does not demonstrate fluorescence emission prior to derivatization with strong fluorescent compound quinine
E) In the determination of stability of recombinant fibroblast by fluorometry, which one of the following is correct?
I. Emission and fluorescence peaks of tyrosine Residues Residues are MEASURED
II. Protein denaturation causes changes in the amount of tyrosine and tryptophan
III. Emission energies of tryptophan are higher than its excitation energy
Choose one:
a. I and II
b. I, II, and III
c. I and III
d. Only I
e. II and III
Discovering Advanced Algebra An Investigative Approach
ISBN: 978-1559539845
1st edition
Authors: Jerald Murdock, Ellen Kamischke, Eric Kamischke