MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
Epinephrine causes an increase in ____________________ |
| A. | blood glucose levels |
| B. | surface receptors |
| C. | rhodopsin pigments |
| D. | mast cells |
| Answer» B. surface receptors | |
| 2. |
The Cholera toxin produced by Vibrio cholera exerts its effect by _____________________ |
| A. | modifying G-protein |
| B. | modifying primary messengers |
| C. | modifying effectors |
| D. | modifying receptors |
| Answer» B. modifying primary messengers | |
| 3. |
The Kaposi’s sarcoma is caused by ____________________ |
| A. | Herpes virus |
| B. | Adeno virus |
| C. | Human immunodeficiency virus |
| D. | Retro virus |
| Answer» B. Adeno virus | |
| 4. |
A somatic mutation is present in all of the individual’s body cells. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Adenoma is caused by the over-secretion of ____________________ |
| A. | arrestin |
| B. | rhodopsin |
| C. | kinetin |
| D. | thyroid hormone |
| Answer» E. | |
| 6. |
Retinitis pigmentosa is an inherited disorder caused due to mutation in the gene that encodes for __________________ |
| A. | G-proteins |
| B. | Arrestin |
| C. | Rhodopsin |
| D. | G-protein receptor kinase |
| Answer» D. G-protein receptor kinase | |
| 7. |
Arrestins compete with ________________ for binding with G-protein coupled receptors. |
| A. | Effectors |
| B. | Primary messengers |
| C. | Secondary messengers |
| D. | G-proteins |
| Answer» E. | |
| 8. |
Desensitization is the process of blocking receptors from turning on ______________ |
| A. | G-proteins |
| B. | Transcription factors |
| C. | Promoters |
| D. | Activators |
| Answer» B. Transcription factors | |
| 9. |
The G-proteins bind only to _________________ |
| A. | cytosine |
| B. | guanine |
| C. | thymine |
| D. | adenine |
| Answer» C. thymine | |
| 10. |
The inactive conformation of a G-protein coupled receptor is stabilized by ____________________ |
| A. | covalent interactions |
| B. | hydrogen binding |
| C. | non-covalent interactions |
| D. | ionic interactions |
| Answer» D. ionic interactions | |
| 11. |
Which of the following is a stimulus for rhodopsin? |
| A. | light |
| B. | acidic pH |
| C. | basic pH |
| D. | neurotoxins |
| Answer» B. acidic pH | |
| 12. |
On the cytoplasmic site of GCPRs, the G-proteins bind to ___________________ |
| A. | amino-terminus |
| B. | promoter region |
| C. | second loop |
| D. | third loop |
| Answer» E. | |
| 13. |
The G-protein coupled receptors have their _____________________ outside the cell. |
| A. | amino terminus |
| B. | carboxyl terminus |
| C. | alpha helices |
| D. | beta helices |
| Answer» B. carboxyl terminus | |
| 14. |
G-protein coupled receptors are referred to as seven-transmembrane receptors. |
| A. | True |
| B. | False |
| Answer» B. False | |