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- Question
The sequence of amino acids in proteins can be determined by means of
Options- A. identification of the -NH2 terminal amino acids
- B. identification of the -COOH terminal amino acids
- C. partial cleavage of the original polypeptide into smaller polypeptides
- D. all of the above
- Correct Answer
- all of the above
- 1. What is meant by rotating frame of reference?
Options- A. That the sample is spun rapidly in the applied field
- B. If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
- C. That the detector rotates around the sample
- D. None of the above Discuss
- 2. In immunofluroscence microscopy, fluroscent compounds are attached to
Options- A. an antibody specific for the subcellular structure
- B. an antigen specific for the subcellular structure
- C. bound antibody specific for the subcellular structure
- D. none of these Discuss
- 3. In FT-NMR, how are nuclei excited?
Options- A. By radio-frequency radiation whose frequency is swept across a predetermined range
- B. By an intense pulse of radiation which contains a wide range of frequencies
- C. By an intense pressure
- D. None of the above Discuss
- 4. How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field?
Options- A. 2
- B. 4
- C. 3
- D. 6 Discuss
- 5. In scanning electron microscopy
Options- A. a specimen is fixed and then coated with thin layer of a heavy metal
- B. a specimen is fixed and then coated with transition metal
- C. a specimen is not fixed and then coated with thin layer of a heavy metal
- D. none of the above Discuss
- 6. The frequency of precession, the transition frequency and the Larmor frequency are
Options- A. different terms for the same frequency
- B. same terms for the same frequency
- C. different terms for the different frequency
- D. same terms for the different frequency Discuss
- 7. What does the Michelson interferometer do?
Options- A. Split a polychromatic beam of radiation into its component wavelengths
- B. Selectively filter certain wavelengths from a beam of I.R. radiation
- C. Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
- D. none of the above Discuss
- 8. When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?
Options- A. The processional frequency of the nucleus increases
- B. The nucleus spins faster
- C. The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
- D. none of the above Discuss
- 9. An FT-IR instrument record a signal in the
Options- A. time domain
- B. frequency domain
- C. both (a) and (b)
- D. none of these Discuss
- 10. 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?
Options- A. Spin - lattice relaxation
- B. Spin - spin relaxation
- C. Spin - spin - spin relaxation
- D. None of these Discuss
FT IR Spectroscopy problems
Search Results
Correct Answer: If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
Correct Answer: an antibody specific for the subcellular structure
Correct Answer: By radio-frequency radiation whose frequency is swept across a predetermined range
Correct Answer: 2
Correct Answer: a specimen is fixed and then coated with thin layer of a heavy metal
Correct Answer: different terms for the same frequency
Correct Answer: Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
Correct Answer: The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
Correct Answer: time domain
Correct Answer: Spin - lattice relaxation
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