MCQOPTIONS
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MCQOPTIONS
This section includes 199 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The phase of mitosis which is associated with the formation of the nuclear envelope, is |
| A. | prophase |
| B. | metaphase |
| C. | anaphase |
| D. | telophase |
| Answer» E. | |
| 2. |
Which of the following statements about mitosis is incorrect? |
| A. | The daughter nuclei are genetically identical to the parent nucleus |
| B. | Chromosomes separate during anaphase due to the interaction of polar microtubules from opposite poles pushing against each other |
| C. | Chromosomes separate during anaphase when the kinetochore microtubules shorten as they depolymerize |
| D. | Chromosomes move to the metaphase plate using motor proteins, a kind of kinesin, attached to spindle fibers |
| Answer» C. Chromosomes separate during anaphase when the kinetochore microtubules shorten as they depolymerize | |
| 3. |
How many chromatids does a diploid body cell contain just prior to cell division? |
| A. | 23 |
| B. | 46 |
| C. | 69 |
| D. | 92 |
| Answer» E. | |
| 4. |
Microtubules grow from the poles to kinetochores of each chromatid during |
| A. | prophase |
| B. | metaphase |
| C. | anaphase |
| D. | telophase |
| Answer» B. metaphase | |
| 5. |
At the __________ checkpoint, cell growth is controlled. |
| A. | C |
| B. | G1 |
| C. | G2 |
| D. | S |
| Answer» C. G2 | |
| 6. |
In which phase, each chromosome replicates to produce two sister chromatids? |
| A. | Anaphase |
| B. | Interphase |
| C. | Metaphase |
| D. | Prophase |
| Answer» C. Metaphase | |
| 7. |
The centromeres move toward the poles in __________ . |
| A. | anaphase |
| B. | interphase |
| C. | metaphase |
| D. | prophase |
| Answer» B. interphase | |
| 8. |
A nuclear envelope forms around each set of sister chromatids in |
| A. | anaphase |
| B. | metaphase |
| C. | prophase |
| D. | telophase |
| Answer» E. | |
| 9. |
In which of these animals does a haploid cell divide mitotically? |
| A. | Humans |
| B. | Male honey bees |
| C. | Female honey bees |
| D. | Rats |
| Answer» C. Female honey bees | |
| 10. |
Which of these cells do not divide? |
| A. | Heart cells |
| B. | Melanocytes |
| C. | Osteocytes |
| D. | Liver cells |
| Answer» B. Melanocytes | |
| 11. |
Protein synthesis takes place in _____ |
| A. | G0 phase |
| B. | G1 phase |
| C. | G2 phase |
| D. | S phase |
| Answer» D. S phase | |
| 12. |
In which phase of the cell cycle does centriole duplication take place? |
| A. | S phase |
| B. | G2 phase |
| C. | G1 phase |
| D. | G0 phase |
| Answer» B. G2 phase | |
| 13. |
During S phase of the cell cycle, the amount of DNA ______ |
| A. | triples |
| B. | remains the same |
| C. | quadruples |
| D. | doubles |
| Answer» E. | |
| 14. |
DNA synthesis involves an increase in chromosome number. True or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
What is the interval between mitosis and DNA replication? |
| A. | S phase |
| B. | G2 phase |
| C. | G1 phase |
| D. | M phase |
| Answer» D. M phase | |
| 16. |
In which phase of the cell cycle does DNA replication take place? |
| A. | Anaphase |
| B. | Metaphase |
| C. | Prophase |
| D. | Interphase |
| Answer» E. | |
| 17. |
Which process does the M phase of cell cycle start with? |
| A. | Karyokinesis |
| B. | Cytokinesis |
| C. | Interphase |
| D. | Spindle formation |
| Answer» B. Cytokinesis | |
| 18. |
Identify the phase of the cell cycle. |
| A. | Prophase |
| B. | G0 |
| C. | G2 |
| D. | Telophase |
| Answer» D. Telophase | |
| 19. |
How much time of the entire cell cycle is occupied by interphase? |
| A. | 75% |
| B. | 95% |
| C. | 50% |
| D. | 80% |
| Answer» C. 50% | |
| 20. |
The period between two M phases is called ______ |
| A. | interphase |
| B. | prophase |
| C. | prometaphase |
| D. | telophase |
| Answer» B. prophase | |
| 21. |
What is the duration of cell cycle in yeast? |
| A. | 30 minutes |
| B. | 24 hours |
| C. | 90 minutes |
| D. | 48 hours |
| Answer» D. 48 hours | |
| 22. |
Which of these is the correct order of events in the cell cycle? |
| A. | G1 → G2 → S → M |
| B. | G1 → G2 → M → S |
| C. | G1 → S → G2 → M |
| D. | S → M → G1 → G2 |
| Answer» D. S → M → G1 → G2 | |
| 23. |
Which of these processes is not a part of the cell cycle? |
| A. | Duplication of genome |
| B. | Division into daughter cells |
| C. | Synthesis of cell organelles |
| D. | Degeneration of centrosome |
| Answer» E. | |
| 24. |
Name the enzyme which causes ubiquitylation and destruction of cyclin. |
| A. | Acid hydrolases |
| B. | Hyaluronidase |
| C. | Ubiquitin ligase |
| D. | Phosphatase |
| Answer» D. Phosphatase | |
| 25. |
Name the cyclin which takes part in M phase? |
| A. | Cyclin E |
| B. | Cyclin A |
| C. | Cyclin D |
| D. | Cyclin B |
| Answer» E. | |
| 26. |
Cyclin binding leads to a change in the _________________ of kinase. |
| A. | pH |
| B. | temperature |
| C. | concentration |
| D. | conformation |
| Answer» E. | |
| 27. |
The regulatory subunit of maturation-promoting factor (MPF) is called _______________ |
| A. | kinase |
| B. | cyclin |
| C. | tetracyclin |
| D. | interleukin |
| Answer» C. tetracyclin | |
| 28. |
The entry of a cell into M phase is initiated by _________________ |
| A. | interleukin factor |
| B. | maturation promoting factor |
| C. | transcription factor |
| D. | necrosis factor |
| Answer» C. transcription factor | |
| 29. |
What will happen if a G2 phase cell is fused with an M phase cell? |
| A. | premature chromosome compaction |
| B. | chromosome aggregation |
| C. | gene transcription |
| D. | inhibition of transcription |
| Answer» B. chromosome aggregation | |
| 30. |
When were the experiments in an effort to understand cell cycle regulation first conducted? |
| A. | 1970s |
| B. | 1980s |
| C. | 1990s |
| D. | 2000s |
| Answer» B. 1980s | |
| 31. |
Cells that have stopped dividing and are arrested in a state preceding that of DNA synthesis, are said to be in the__________ |
| A. | S phase |
| B. | G1 phase |
| C. | G0 phase |
| D. | G2 phase |
| Answer» D. G2 phase | |
| 32. |
Which of the following cells are capable of asymmetric cell division? |
| A. | Hepatocytes |
| B. | Epithelial cells |
| C. | Stem cells |
| D. | Neurons |
| Answer» D. Neurons | |
| 33. |
Which of the following cells do not usually divide but can be induced to divide? |
| A. | red blood cells |
| B. | liver cells |
| C. | hair cells |
| D. | hair follicles |
| Answer» C. hair cells | |
| 34. |
Which of the following cells do not lack the ability to divide? |
| A. | skin cells |
| B. | nerve cells |
| C. | muscle cells |
| D. | red blood cells |
| Answer» B. nerve cells | |
| 35. |
DNA replication occurs during _________________ of the cell cycle. |
| A. | S phase |
| B. | Interphase |
| C. | G2 phase |
| D. | G0 phase |
| Answer» B. Interphase | |
| 36. |
DNA replication can be monitored by incorporation of ______________________ |
| A. | tyrosine |
| B. | thymidine |
| C. | cytosine |
| D. | nitite |
| Answer» C. cytosine | |
| 37. |
Asynchronous cultures are the ones whose cells are _______________________ |
| A. | of different origin |
| B. | randomly distributed through the cell cycle |
| C. | have different genomic content |
| D. | have different nutrient requirements |
| Answer» C. have different genomic content | |
| 38. |
Meiosis produces cells that have half the genetic content as their parent cells. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 39. |
There are ______ major phases in a cell cycle. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 40. |
Which term is used to refer to a period between the cell divisions? |
| A. | M phase |
| B. | G0 phase |
| C. | Interphase |
| D. | Resting phase |
| Answer» D. Resting phase | |
| 41. |
During catabolism, only about 40% of the energy available from oxidizing glucose is used to synthesize ATP. Remaining 60% |
| A. | is used to reduce NADP |
| B. | is lost as heat |
| C. | is stored as fat. |
| D. | remains in the products of metabolism |
| Answer» C. is stored as fat. | |
| 42. |
An early sign of retinol deficiencies in man is |
| A. | keratinization |
| B. | night blindness |
| C. | none of these |
| D. | xeropthalmia |
| Answer» C. none of these | |
| 43. |
Each chromosome contains two chromatids by the end of the __________ phase in the life cycle of a human cell. |
| A. | G2 |
| B. | C |
| C. | S |
| D. | M |
| Answer» D. M | |
| 44. |
What is used to cool the superconducting coil? |
| A. | Ice |
| B. | Hydrogen |
| C. | Liquid helium |
| D. | Dry ice |
| Answer» D. Dry ice | |
| 45. |
Fatty acids are oxidized to acetyl-CoA by which of the following pathways? |
| A. | Entner-Doudoroff |
| B. | β-oxidation |
| C. | Embden-Meyerhof pathway |
| D. | pentose phosphate pathway |
| Answer» B. β-oxidation | |
| 46. |
What do NAD , NADP , and FAD all have in common? |
| A. | They have a full complement of electrons |
| B. | They are reduced |
| C. | They are what is used during carbon fixation in photosynthesis |
| D. | They are oxidized |
| Answer» E. | |
| 47. |
Ion exchange chromatography is based on the |
| A. | electrical mobility of ionic species |
| B. | electrostatic attraction |
| C. | partition chromatography |
| D. | adsorption chromatography |
| Answer» C. partition chromatography | |
| 48. |
In gas chromatography, the basis for separation of the components of the volatile material is the difference in |
| A. | conductivity |
| B. | partition coefficients |
| C. | molarity |
| D. | molecular weight |
| Answer» C. molarity | |
| 49. |
A medium containing crystal violet dye plus sodium deoxycholate will allow |
| A. | gram ( )ve intestinal bacteria to grow |
| B. | gram (-)ve intestinal bacteria to grow |
| C. | none of these |
| D. | aquatic bacteria to grow |
| Answer» C. none of these | |
| 50. |
In the glycogen synthase reaction, the precursor to glycogen is |
| A. | UTP-glucose |
| B. | glucose-6-P |
| C. | glucose-1-P |
| D. | UDP-glucose |
| Answer» E. | |