MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Protein Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In X ray crystallography, the crystal is gradually rotated and a diffraction pattern is acquired for each distinct orientation. |
| A. | False |
| B. | True |
| Answer» C. | |
| 2. |
If a beam of X ray has energy E=30 x 10-16J, what will be the frequency of this wave? |
| A. | 5.523 x 10<sup>18</sup> Hz |
| B. | 9.523 x 10<sup>18</sup> Hz |
| C. | 8.523 x 10<sup>18</sup> Hz |
| D. | 4.523 x 10<sup>18</sup> Hz |
| Answer» E. | |
| 3. |
If a beam of X ray has a wavelength of 1 A , then what is the energy of this wave? |
| A. | 39.78 x 10<sup>-16</sup>erg |
| B. | 19.89 x 10<sup>-16</sup>erg |
| C. | 39.78 x 10<sup>-16</sup>J |
| D. | 19.89 x 10<sup>-16</sup>J |
| Answer» E. | |
| 4. |
An X ray having a wavelength of 1.67 x 10-10 undergoes the first-order reflection. What is the glancing angle ( ) if the spacing between the two planes is 6 x 10-10? |
| A. | 6.25 |
| B. | 8.99 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 5. |
The wavelength of X rays used in X ray crystallography is 8 x 10-10 m. It undergoes the first-order reflection at a glancing angle of 4.59 . What is the spacing between the atomic planes? |
| A. | 4 x 10<sup>-9</sup> m |
| B. | 15 x 10<sup>-9</sup> m |
| C. | 10 x 10<sup>-9</sup> m |
| D. | 5 x 10<sup>-9</sup> m |
| Answer» E. | |
| 6. |
Which of the following detector is used for proteins in the X ray crystallography? |
| A. | Scintillation counters |
| B. | Proportional counters |
| C. | Optical cameras |
| D. | CCD cameras |
| Answer» E. | |
| 7. |
What is the device on which the crystal (grown in a lab) is mounted known as? |
| A. | X ray source |
| B. | Collimator |
| C. | Refractometer |
| D. | Goniometer |
| Answer» E. | |
| 8. |
What is produced by the analysis of X ray diffraction data sets? |
| A. | Molecular density maps |
| B. | Nuclei density maps |
| C. | Atom density maps |
| D. | Electron density maps |
| Answer» E. | |
| 9. |
For which of the following path difference, the superimposing waves will not interfere constructively? |
| A. | 3 |
| B. | 4 |
| C. | 11 |
| D. | 11.5 |
| Answer» E. | |
| 10. |
Which among the following is not a method to generate X -rays? |
| A. | Synchrotron radiation source |
| B. | Radioactive decay process |
| C. | Bombarding a metal source with a beam of high energy electrons |
| D. | Bombarding a metal source with a beam of high energy electromagnetic radiation |
| Answer» E. | |
| 11. |
X ray crystallography requires the formation of pure crystals to acquire accurate results. |
| A. | False |
| B. | True |
| Answer» C. | |
| 12. |
What is the first step in the X ray crystallography of proteins? |
| A. | Creating an electron density map |
| B. | X ray diffraction |
| C. | Precipitation of protein |
| D. | Purification of protein |
| Answer» E. | |
| 13. |
Which of the following is not a component needed for the X ray crystallography of proteins? |
| A. | Protein crystal |
| B. | Source of X rays |
| C. | Detector |
| D. | Monochromator |
| Answer» E. | |