MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Secretory proteins are synthesized by ____________ |
| A. | Ribosomes on the nuclear membrane |
| B. | Ribosomes on endoplasmic reticulum |
| C. | Free ribosomes |
| D. | None of the mentioned |
| Answer» C. Free ribosomes | |
| 2. |
Nuclear localization signal is rich in ____________ |
| A. | Tryptophan and histidine |
| B. | Serine and threonine |
| C. | Glutamine and asparagine |
| D. | Lysine and arginine |
| Answer» E. | |
| 3. |
Which is the correct order of transport of protein in a secretory pathway? |
| A. | Protein synthesized in the cytoplasm-SER lumen-RER lumen-cis Golgi-median Golgi-trans Golgi-vesicles-fusion of vesicles with plasma membrane-exocytosis |
| B. | Protein synthesized in the cytoplasm-RER lumen-cis Golgi-median Golgi-trans Golgi-vesicles-fusion of vesicles with plasma membrane-exocytosis |
| C. | Protein synthesized in the cytoplasm- vesicles -SER lumen-RER lumen-cis Golgi-median Golgi-trans Golgi-fusion of vesicles with plasma membrane-exocytosis |
| D. | Protein synthesized in the cytoplasm- RER lumen-trans Golgi -median Golgi-cis Golgi -vesicles-fusion of vesicles with plasma membrane-exocytosis |
| Answer» C. Protein synthesized in the cytoplasm- vesicles -SER lumen-RER lumen-cis Golgi-median Golgi-trans Golgi-fusion of vesicles with plasma membrane-exocytosis | |
| 4. |
Signal sequences are ____________ |
| A. | Short peptide sequences attached to a protein that initiates its degradation by digestive enzymes |
| B. | Short peptide sequences to transport a protein to the nucleus |
| C. | Glycoproteins that serve as an address for transporting newly synthesized protein to the correct location |
| D. | Short peptide sequences that serve as an address for transporting newly synthesized proteins to the correct location |
| Answer» E. | |
| 5. |
Proteins tagged with mannose 6-phosphate are transported to ____________ |
| A. | Golgi complex |
| B. | Mitochondria |
| C. | Lysosome |
| D. | Nucleus |
| Answer» D. Nucleus | |
| 6. |
What are the two subassemblies of 26S proteasome? |
| A. | 20S core particle and 19S regulatory particle |
| B. | 20S regulatory particle and 19S core particle |
| C. | 18S core particle and 19S regulatory particle |
| D. | 20S core particle and 18S regulatory particle |
| Answer» B. 20S regulatory particle and 19S core particle | |
| 7. |
The coated pits are coated on their cytosolic side with a lattice of ____________ |
| A. | Clathrin |
| B. | Lipoprotein |
| C. | Glycoprotein |
| D. | Transferrin |
| Answer» B. Lipoprotein | |
| 8. |
The antibiotic aided in elucidating the steps of protein glycosylation is ____________ |
| A. | Streptomycin |
| B. | Tunicamycin |
| C. | Penicillin |
| D. | Crocin |
| Answer» C. Penicillin | |
| 9. |
Posttranslational modification of many eukaryotic proteins begins in the ____________ |
| A. | Endoplasmic reticulum |
| B. | Mitochondria |
| C. | Chloroplasts |
| D. | Nucleus |
| Answer» B. Mitochondria | |