MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Building blocks of nucleic acids are ____________ |
| A. | Nucleotides |
| B. | Nucleosides |
| C. | Amino acids |
| D. | Histones |
| Answer» B. Nucleosides | |
| 2. |
The sugar molecule in a nucleotide is ____________ |
| A. | Pentose |
| B. | Hexose |
| C. | Tetrose |
| D. | Triose |
| Answer» B. Hexose | |
| 3. |
Group of adjacent nucleotides are joined by ____________ |
| A. | Phosphodiester bond |
| B. | Peptide bond |
| C. | Ionic bond |
| D. | Covalent bond |
| Answer» B. Peptide bond | |
| 4. |
What is the composition of nucleotide? |
| A. | a sugar + a phosphate |
| B. | a base + a sugar |
| C. | a base + a phosphate |
| D. | a base + a sugar + phosphate |
| Answer» E. | |
| 5. |
Identify the purine base of nucleic acids in the following. |
| A. | Cytosine |
| B. | Thymine |
| C. | Uracil |
| D. | Adenine |
| Answer» E. | |
| 6. |
BUILDING_BLOCKS_OF_NUCLEIC_ACIDS_ARE?$ |
| A. | Nucleotides |
| B. | Nucleosides |
| C. | Amino acids |
| D. | Histones |
| Answer» B. Nucleosides | |
| 7. |
Which of the following is false about purine and pyrimidine bases? |
| A. | They are hydrophobic and relatively insoluble in water at the near-neutral pH of the cell |
| B. | At acidic or alkaline pH the bases become charged and their solubility in water increases |
| C. | Purines have two rings in their structure, but pyrimidine bases have only one ring |
| D. | At acidic or alkaline pH the bases become charged and their solubility in water decreases |
| Answer» E. | |
| 8. |
Which of the following is true about phosphodiester linkage? |
| A. | 5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide |
| B. | 3’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide |
| C. | 5’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide |
| D. | 3’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide |
| Answer» B. 3‚Äö√Ñ√∂‚àö√ë‚àö¬•-phosphate group of one nucleotide unit is joined to the 5‚Äö√Ñ√∂‚àö√ë‚àö¬•-hydroxyl group of the next nucleotide | |
| 9. |
The sugar molecule in a nucleotide is |
| A. | Pentose |
| B. | Hexose |
| C. | Tetrose |
| D. | Triose |
| Answer» B. Hexose | |
| 10. |
Group of adjacent nucleotides are joined by |
| A. | Phosphodiester bond |
| B. | Peptide bond |
| C. | Ionic bond |
| D. | Covalent bond |
| Answer» B. Peptide bond | |
| 11. |
What is the composition of nucleoside? |
| A. | a sugar + a phosphate |
| B. | a base + a sugar |
| C. | a base + a phosphate |
| D. | a base + a sugar + phosphate |
| Answer» C. a base + a phosphate | |
| 12. |
Which of the following are not the components of RNA? |
| A. | Thymine |
| B. | Adenine |
| C. | Guanine |
| D. | Cytosine |
| Answer» B. Adenine | |
| 13. |
Identify the purine base of nucleic acids in the following |
| A. | Cytosine |
| B. | Thymine |
| C. | Uracil |
| D. | Adenine |
| Answer» E. | |