MCQOPTIONS
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MCQOPTIONS
This section includes 267 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Secretory proteins are synthesized by |
| A. | Ribosomes on nuclear membrane |
| B. | Ribosomes on endoplasmic reticulum |
| C. | Free ribosomes |
| D. | None of the mentioned |
| Answer» C. Free ribosomes | |
| 252. |
The correct order of transport of protein in a secretory pathway is |
| 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 | |
| 253. |
Nuclear localization signal is rich in |
| A. | Tryptophan and histidine |
| B. | Serine and threonine |
| C. | Glutamine and asparagine |
| D. | Lysine and arginine |
| Answer» E. | |
| 254. |
A polysome could be best described as |
| A. | an active site of DNA synthesis. |
| B. | an active site of protein synthesis. |
| C. | an active site of lipid synthesis. |
| D. | all of the above. |
| Answer» C. an active site of lipid synthesis. | |
| 255. |
Retroviruses replicate via __________ intermediate |
| A. | RNA |
| B. | DNA |
| C. | mRNA |
| D. | rDNA |
| Answer» C. mRNA | |
| 256. |
An important difference between eukaryotic and prokaryotic DNA replication is |
| A. | eukaryotic DNA polymerases are faster |
| B. | more DNA polymerases are found in eukaryotes |
| C. | multiple origins of replication in eukaryotes |
| D. | RNA primers are not required in eukaryotes |
| Answer» D. RNA primers are not required in eukaryotes | |
| 257. |
The replication of a linear DNA molecule in a eukaryotic chromosome creates a problem which is reported to be sorted out by |
| A. | using enzyme called telomerase |
| B. | shortening of the double stranded replicated portion |
| C. | using RNA as a template |
| D. | none of the above |
| Answer» B. shortening of the double stranded replicated portion | |
| 258. |
The coated pits are coated on their cytosolic side with a lattice of |
| A. | Clathrin |
| B. | Lipoprotein |
| C. | Gycoprotein |
| D. | Transferrin |
| Answer» B. Lipoprotein | |
| 259. |
Posttranslational modification of many eukaryotic proteins begins in the |
| A. | Endoplasmic reticulum |
| B. | Mitochondria |
| C. | Chloroplasts |
| D. | Nucleus |
| Answer» B. Mitochondria | |
| 260. |
When there is no net bending of the DNA axis upon itself, the DNA is said to be in a |
| A. | Elongated state |
| B. | Compressed state |
| C. | Relaxed state |
| D. | Denatured state |
| Answer» D. Denatured state | |
| 261. |
The antibiotic aided in elucidating the steps of protein glycosylation is |
| A. | Streptomycin |
| B. | Tunicamycin |
| C. | Penicillin |
| D. | Chrocin |
| Answer» C. Penicillin | |
| 262. |
Which of the following is false about introns? |
| A. | They are non-protein coding genes |
| B. | They are protein coding genes |
| C. | They are removed by splicing |
| D. | Integral to gene expression regulation |
| Answer» C. They are removed by splicing | |
| 263. |
Which DNA polymerase removes RNA primers in DNA synthesis? |
| A. | Polymerase I |
| B. | Polymerase II |
| C. | Polymerase III |
| D. | none of these |
| Answer» B. Polymerase II | |
| 264. |
If one cell has AT contents 40%, what will be the percentage of Guanine residue? |
| A. | 60% |
| B. | 15% |
| C. | 30% |
| D. | Guanine residue can not be calculated |
| Answer» D. Guanine residue can not be calculated | |
| 265. |
Which of the following enzyme adds complementary bases during replication? |
| A. | Helicase |
| B. | Synthesase |
| C. | Replicase |
| D. | Polymerase |
| Answer» E. | |
| 266. |
The overall conclusion of the Hershey-Chase experiment was that |
| A. | DNA was responsible for heredity |
| B. | proteins and DNA were responsible for heredity |
| C. | the ratio of Adenine to thymine was always the same |
| D. | phage DNA was similar to bacterial DNA |
| Answer» B. proteins and DNA were responsible for heredity | |
| 267. |
A cesium chloride will separate DNA molecules by |
| A. | absorption |
| B. | resorption |
| C. | density |
| D. | adhesion |
| Answer» D. adhesion | |