MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
Which of the following is used to visualize DNA molecules in a gel? |
| A. | ethidium bromide |
| B. | methylene blue |
| C. | safranin |
| D. | bromophenol blue |
| Answer» B. methylene blue | |
| 2. |
Supercoiled DNA is more compact than its relaxed counterpart and therefore __________ |
| A. | has lower pH value |
| B. | sediments faster |
| C. | sediments slower |
| D. | denatures quickly |
| Answer» C. sediments slower | |
| 3. |
The supercoiled state of DNA was first discovered in the year __________ |
| A. | 1943 |
| B. | 1953 |
| C. | 1963 |
| D. | 1973 |
| Answer» D. 1973 | |
| 4. |
Proteins can interact with a DNA molecule by ____________________ |
| A. | fitting into the grooves |
| B. | interacting with the base pairs |
| C. | hydrophilic interactions |
| D. | covalent linkages |
| Answer» B. interacting with the base pairs | |
| 5. |
What is the width of the DNA double helix? |
| A. | 1 nm |
| B. | 2 nm |
| C. | 3 nm |
| D. | 4 nm |
| Answer» C. 3 nm | |
| 6. |
Which kinds of forces stabilize the DNA structure? |
| A. | hydrophilic, covalent |
| B. | hydrophobic, covalent |
| C. | hydrophobic, van der Waals |
| D. | hydrophilic, van der Waals |
| Answer» D. hydrophilic, van der Waals | |
| 7. |
The phosphate molecules present on the DNA strand give it a large positive charge. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
The helical nature of DNA was revealed by the work of ______________ |
| A. | Rosalind Franklin |
| B. | Francis Crick |
| C. | Louis Pasteur |
| D. | Frederick Sanger |
| Answer» B. Francis Crick | |
| 9. |
Who suggested that DNA composed of three nucleotide strands? |
| A. | Linus Pauling |
| B. | Rosalind Franklin |
| C. | Maurice Wilkins |
| D. | James Watson |
| Answer» B. Rosalind Franklin | |
| 10. |
Which of the following was discovered by Chargaff s experiment in 1950? |
| A. | base composition |
| B. | base stacking |
| C. | gene morphology |
| D. | chromosome morphology |
| Answer» B. base stacking | |
| 11. |
A nucleotide has a non-polarized structure. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Guanine and adenine are _______________ |
| A. | purines |
| B. | pyrimidines |
| C. | nucleosides |
| D. | gangliosides |
| Answer» B. pyrimidines | |
| 13. |
Purines are a type of nitrogenous bases that consist of _____ ring(s). |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 14. |
Nucleotide, basic unit of DNA consists of the sugar _________________ |
| A. | deoxyribose |
| B. | oxyribose |
| C. | mannose |
| D. | fructose |
| Answer» B. oxyribose | |
| 15. |
The DNA structure was investigated in the year __________ |
| A. | 1943 |
| B. | 1953 |
| C. | 1963 |
| D. | 1973 |
| Answer» C. 1963 | |