MCQOPTIONS
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MCQOPTIONS
This section includes 64 Mcqs, each offering curated multiple-choice questions to sharpen your Molecular Biology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Nucleoside is a pyrimidine or purine base |
| A. | covalently bonded to a sugar |
| B. | ionically bonded to a sugar |
| C. | hydrogen bonded to a sugar |
| D. | none of the above |
| Answer» B. ionically bonded to a sugar | |
| 52. |
Because DNA is a highly charged polyanion, its stability to heat denaturation |
| A. | does not depend on hydrophobic interactions |
| B. | increases with increasing salt |
| C. | is independent of G - C content |
| D. | decreases with increasing salt |
| Answer» C. is independent of G - C content | |
| 53. |
Which pyrimidine base contains an amino group at carbon 4? |
| A. | Cytosine |
| B. | Thymine |
| C. | Uracil |
| D. | Adenine |
| Answer» B. Thymine | |
| 54. |
In gel electrophoresis, what fragments will move most quickly through a gel? |
| A. | Large fragments |
| B. | Small fragments |
| C. | Large genome |
| D. | None of these |
| Answer» C. Large genome | |
| 55. |
WHICH_OF_THE_FOLLOWING_FACTORS_DO_NOT_PROVIDE_TO_THE_SEPARATION_OF_DNA_FRAGMENTS_DURING_ELECTROPHORESIS??$ |
| A. | Chargaff’s rule |
| B. | Matrix density |
| C. | Ethidium bromide |
| D. | Size |
| Answer» D. Size | |
| 56. |
Which one of the following is not a function of a nucleotide?$ |
| A. | Nucleic acid monomer |
| B. | Ribozyme |
| C. | Energy carrier molecules |
| D. | Receptors |
| Answer» E. | |
| 57. |
Which of the following is not a characteristic of nucleotide bases? |
| A. | Planar |
| B. | Heterocyclic |
| C. | Aliphatic |
| D. | Ubiquitous |
| Answer» D. Ubiquitous | |
| 58. |
In a diploid organism with 30,000 bases haploid genome contains 23% A residues. What is the number of G residues in the genome of this organism? |
| A. | 16000 |
| B. | 16200 |
| C. | 16500 |
| D. | 14200 |
| Answer» C. 16500 | |
| 59. |
In one strand of a double stranded DNA the rate of occurrence of A is 3 times C in consecutive 10 bases. So how many G will be there in 100 base pairs of a DNA duplex?[Consider G=T in one strand]. |
| A. | 30 |
| B. | 20 |
| C. | 40 |
| D. | 60 |
| Answer» D. 60 | |
| 60. |
According to Chargaff’s rule the two strands of DNA has ___________$ |
| A. | Same molecular weight |
| B. | Same amount of A and G |
| C. | Different amount of A and G |
| D. | Different molecular weight |
| Answer» E. | |
| 61. |
Which of the following is not a component of the nucleic acid backbone? |
| A. | Pentose sugar |
| B. | Phosphate group |
| C. | Nucleotide |
| D. | Phosphodiesterase bond |
| Answer» D. Phosphodiesterase bond | |
| 62. |
With respect to nucleosides which of the following is paired correctly? |
| A. | Purine – Adenosine, Thymidine |
| B. | Purine – Guanosine, Thymidine |
| C. | Pyrimidine – Uridine, Cytidine |
| D. | Pyrimidine – Uridine, Adenosine |
| Answer» D. Pyrimidine ‚Äö√Ñ√∂‚àö√ë‚àö¬® Uridine, Adenosine | |
| 63. |
Which of the following is wrongly paired? |
| A. | Proteins – peptide bond |
| B. | Nucleic acid – hydrogen bond |
| C. | Polysaccharide – glycosidic bond |
| D. | Phospholipids –phosphate linkage |
| Answer» C. Polysaccharide ‚Äö√Ñ√∂‚àö√ë‚àö¬® glycosidic bond | |
| 64. |
Which macromolecule is not abundantly found though being of critical importance for biological mechanism? |
| A. | Proteins |
| B. | Lipids |
| C. | Nucleic acids |
| D. | Polysaccharides |
| Answer» C. Nucleic acids | |