MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The DNA that actually codes for a protein's primary structure in eukaryotes is |
| A. | the entire gene |
| B. | portions of the gene called introns |
| C. | portions of the gene called exons |
| D. | the promoter |
| Answer» D. the promoter | |
| 2. |
Which of the following is true about Z-DNA helix? |
| A. | It has alternating GC sequences |
| B. | It is a permanent conformation of DNA |
| C. | It tends to be found at the 3’ end of the genes |
| D. | It has fewer base pairs per turn than B-DNA |
| Answer» B. It is a permanent conformation of DNA | |
| 3. |
Which one of the following nucleic acids has a left handed helix? |
| A. | M-RNA |
| B. | T-RNA |
| C. | A-DNA |
| D. | Z-DNA |
| Answer» E. | |
| 4. |
Arrangement of nucleotides in DNA can be seen by ____________ |
| A. | Ultracentrifuge |
| B. | X-Ray crystallography |
| C. | Light microscope |
| D. | Electron microscope |
| Answer» C. Light microscope | |
| 5. |
According to Chargaff’s rule, in a DNA molecule ____________ |
| A. | The amount of adenine and thymine is equal to the amount of guanine and cytosine |
| B. | The amount of adenine and guanine is equal to the amount of thymine and cytosine |
| C. | The amount of adenine and uracil is equal to the amount of guanine and cytosine |
| D. | The amount of adenine and guanine is equal to the amount of uracil and cytosine |
| Answer» B. The amount of adenine and guanine is equal to the amount of thymine and cytosine | |
| 6. |
In which of the following uracil is present? |
| A. | DNA |
| B. | RNA |
| C. | None of these |
| D. | Both ( and ( |
| Answer» C. None of these | |
| 7. |
Which is not an essential part of a two-component phosphorelay system? |
| A. | Sensor kinase |
| B. | Response regulator |
| C. | None of these |
| D. | Autoinducer |
| Answer» E. | |
| 8. |
According to base pairing rules the bases of one strand match-up with the bases of the second strand of DNA and the two strands are said to be |
| A. | oppositely charged |
| B. | complementary |
| C. | none of these |
| D. | identical |
| Answer» C. none of these | |
| 9. |
The DNA that actually codes for a protein\'s primary structure in eukaryotes is |
| A. | portions of the gene called introns |
| B. | the entire gene |
| C. | the promoter |
| D. | portions of the gene called exons |
| Answer» E. | |
| 10. |
In DNA sequencing, the primer |
| A. | specifies where the sequence begins |
| B. | specifies where the sequence ends |
| C. | generates variety of different sized fragments |
| D. | both ( and ( |
| Answer» B. specifies where the sequence ends | |
| 11. |
WHICH_OF_THE_FOLLOWING_IS_TRUE_ABOUT_Z-DNA_HELIX??$ |
| A. | It has alternating GC sequences |
| B. | It is a permanent conformation of DNA |
| C. | It tends to be found at the 3’ end of the genes |
| D. | It has fewer base pairs per turn than B-DNA |
| Answer» B. It is a permanent conformation of DNA | |
| 12. |
Which of the following statements is true?$ |
| A. | The template strand matches the sequence of the RNA transcript |
| B. | The two strands of DNA run parallel to each other |
| C. | G-C bonds are much more resistant to denaturation than A-T rich regions |
| D. | The common form of DNA is left handed |
| Answer» D. The common form of DNA is left handed | |
| 13. |
Which of the following statements is not true about RNA? |
| A. | Does not have a double stranded structure |
| B. | Thymine is present |
| C. | Does not obey Chargaff’s rule |
| D. | The sugar contained in RNA is a ribose |
| Answer» C. Does not obey Chargaff‚Äö√Ñ√∂‚àö√ë‚àö¬•s rule | |
| 14. |
One of the following nucleic acids has a left handed helix |
| A. | M-RNA |
| B. | T-RNA |
| C. | A-DNA |
| D. | Z-DNA |
| Answer» E. | |
| 15. |
Which of the following leads to disruption of nucleosomal structure? |
| A. | Acetylation |
| B. | Carboxylation |
| C. | Phosphorylation |
| D. | Methylation |
| Answer» E. | |
| 16. |
Arrangement of nucleotides in DNA can be seen by |
| A. | Ultracentrifuge |
| B. | X-Ray crystallography |
| C. | Light microscope |
| D. | Electron microscope |
| Answer» C. Light microscope | |
| 17. |
According to Chargaff’s rule, in a DNA molecule$ |
| A. | The amount of adenine and thymine is equal to the amount of guanine and cytosine |
| B. | The amount of adenine and guanine is equal to the amount of thymine and cytosine |
| C. | The amount of adenine and uracil is equal to the amount of guanine and cytosine |
| D. | The amount of adenine and guanine is equal to the amount of uracil and cytosine |
| Answer» B. The amount of adenine and guanine is equal to the amount of thymine and cytosine | |
| 18. |
Which ratio is constant for DNA? |
| A. | A + G / T + C |
| B. | A + T / G + C |
| C. | A + C / U + G |
| D. | A + U / G + C |
| Answer» B. A + T / G + C | |
| 19. |
Number of hydrogen bonds between guanine and cytosine? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 20. |
Number of hydrogen bonds between adenine and thymine? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |