MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Cell Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In the proteasome, the unfolded protein is threaded through narrow opening in the ring of ___________________ |
| A. | ligase |
| B. | sigma factor |
| C. | alpha-subunit |
| D. | beta-subunit |
| Answer» D. beta-subunit | |
| 2. |
Which part of the proteasome recognizes a polyubiquitinated protein? |
| A. | alpha-subunit |
| B. | beta-subunit |
| C. | gamma-subunit |
| D. | end caps |
| Answer» C. gamma-subunit | |
| 3. |
For enzymatic degradation, Ubiquitin is transferred from the carrier protein to _______________ residue. |
| A. | arginine |
| B. | cytosine |
| C. | lysine |
| D. | alanine |
| Answer» D. alanine | |
| 4. |
A number of ubiquitin molecules must be attached to ensure enzymatic degradation of a polypeptide. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Ubiquitin is a ___________________ |
| A. | protein |
| B. | organelle |
| C. | nuclear body |
| D. | aggragated complex |
| Answer» B. organelle | |
| 6. |
“Degron” is a __________ |
| A. | enzyme |
| B. | polypeptide |
| C. | amino acid sequence |
| D. | nucleic acid sequence |
| Answer» D. nucleic acid sequence | |
| 7. |
Proteins that terminate in arginine are short-lived. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
How many β-subunits are there in proteasomes? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 9. |
Degradation of cellular unwanted proteins is carried out in _________ |
| A. | Proteasomes |
| B. | Lysosome |
| C. | Peroxisomes |
| D. | Ribosomes |
| Answer» B. Lysosome | |