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. |
Glycolipids are synthesized in the ER and ____________ |
| A. | Nucleus |
| B. | Golgi complex |
| C. | Mitochondrion |
| D. | Plasma membrane |
| Answer» C. Mitochondrion | |
| 2. |
Hydrophobic transmembrane segments of which proteins are not synthesized in the endoplasmic reticulum? |
| A. | integral membrane proteins |
| B. | lysosomal proteins |
| C. | steroids |
| D. | secretory proteins |
| Answer» B. lysosomal proteins | |
| 3. |
The cysteine residues present in the reduced form in peptides that enter the endoplasmic reticulum lumen are converted into ____________ when they leave the compartment. |
| A. | hydrolyzed bonds |
| B. | hydrophobic bonds |
| C. | disulfide bonds |
| D. | hydrophilic bonds |
| Answer» D. hydrophilic bonds | |
| 4. |
Which of the following enzyme present in the rough endoplasmic reticulum removes the signal sequence from nascent polypeptides? |
| A. | signal oxidase |
| B. | signal peptidase |
| C. | olisaccharyltransferase |
| D. | luciferase |
| Answer» C. olisaccharyltransferase | |
| 5. |
Translocon is a ____________ |
| A. | polypeptide |
| B. | protein channel |
| C. | receptor |
| D. | recognition particle |
| Answer» C. receptor | |
| 6. |
In mammalian cells, the signal recognition particle (SRP) consists of ____ distinct polypeptides and one small RNA molecule. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 7. |
In yeast cells, protein transport across the endoplasmic reticulum membrane occurs __________ |
| A. | perpendicularly |
| B. | discontinuously |
| C. | co-translationally |
| D. | post-translationally |
| Answer» E. | |
| 8. |
The signal sequence that determines whether a protein will be synthesized on a free ribosome or ribosome attached to endoplasmic reticulum is located at _______ |
| A. | N-terminal |
| B. | C-terminal |
| C. | hydrophobic tail |
| D. | hydrophilic tail |
| Answer» B. C-terminal | |
| 9. |
Sarcoplasmic reticulum is found in ________________ |
| A. | liver cells |
| B. | kidney cells |
| C. | muscle cells |
| D. | neurons |
| Answer» D. neurons | |
| 10. |
Which enzymes are responsible for detoxification of organic compounds carried out by the smooth endoplasmic reticulum? |
| A. | Dehydrogenases |
| B. | Oxygenases |
| C. | Nucleases |
| D. | Ribonucleases |
| Answer» C. Nucleases | |
| 11. |
Detoxification of organic compounds like barbiturates and ethanol in the liver is carried out by ________________ |
| A. | smooth endoplasmic reticulum |
| B. | sarcoplasmic reticulum |
| C. | rough endoplasmic reticulum |
| D. | nucleus |
| Answer» B. sarcoplasmic reticulum | |
| 12. |
All the cells contain the same ratio of rough and smooth endoplasmic reticulum. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Which of the following biomolecules are not synthesized by the endoplasmic reticulum? |
| A. | Proteins |
| B. | Lipids |
| C. | Nucleic acids |
| D. | Cholesterol |
| Answer» D. Cholesterol | |
| 14. |
The membranes of rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER) are continuous. |
| A. | True |
| B. | False |
| Answer» B. False | |