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Q. No.What are the two key differences between DNA and RNA?
| 1. | DNA contains thymine and ribose, RNA contains uracil and deoxyribose. |
| 2. | DNA contains uracil and ribose, RNA contains thymine and deoxyribose. |
| 3. | DNA contains uracil and deoxyribose, RNA contains thymine and ribose. |
| 4. | DNA contains thymine and deoxyribose, RNA contains uracil and ribose. |
Subtopic: Nucleic Acid |
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Level 1: 80%+
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Adenine and guanine are:
1. Substituted purines
2. Substituted pyrimidines
3. Deoxyribonucleosides
4. Ribonucleotides
Subtopic: Nucleic Acid |
89%
Level 1: 80%+
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Consider the given two statements:
| Assertion(A): | The B-DNA form of the double helix has a pitch of 36Å and each turn consists of TWELVE base pairs. |
| Reason(R): | At each step of ascent, the strand turns 34°. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Nucleic Acid |
88%
Level 1: 80%+
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All of the following statements regarding nitrogen bases, nucleosides, nucleotides, and nucleic acids are correct EXCEPT:
| 1. | Nitrogen bases such as adenine, guanine, cytosine, uracil, and thymine contain heterocyclic rings. |
| 2. | When a nitrogen base is attached to a sugar molecule, the compound formed is called a nucleoside. |
| 3. | Nucleotides are formed when a nitrogen base is directly esterified to a phosphate group without sugar involvement. |
| 4. | DNA and RNA are nucleic acids, composed exclusively of nucleotides, and can function as genetic material. |
Subtopic: Nucleic Acid | Nucleic Acid: Nucleotides |
88%
Level 1: 80%+
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The back bone of RNA consists of which of the following sugar?
1. Deoxyribose
2. Ribose
3. Sucrose
4. Maltose
1. Deoxyribose
2. Ribose
3. Sucrose
4. Maltose
Subtopic: Nucleic Acid |
87%
Level 1: 80%+
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Consider the given two statements:
| Assertion(A): | In the Watson-Crick model of DNA, adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C). |
| Reason(R): | Adenine and thymine form three hydrogen bonds, while guanine and cytosine form two hydrogen bonds. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Nucleic Acid |
84%
Level 1: 80%+
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The number of cyclic rings present in purines and pyrimidines are
1. 2,1 respectively
2. 1,2 respectively
3. 2,2 respectively
4. 1,1 respectively
Subtopic: Nucleic Acid |
83%
Level 1: 80%+
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In a nucleic acid a phosphate moiety links the:
| 1. | 3’-carbon of one sugar of one nucleotide to the 5’-carbon of the sugar of the succeeding nucleotide. |
| 2. | 5’-carbon of one sugar of one nucleotide to the 1’-carbon of the sugar of the succeeding nucleotide. |
| 3. | 3’-carbon of one sugar of one nucleotide to the 2’-carbon of the sugar of the succeeding nucleotide. |
| 4. | 2’-carbon of one sugar of one nucleotide to the 5’-carbon of the sugar of the succeeding nucleotide. |
Subtopic: Nucleic Acid | Nucleic Acid: Nucleotides |
83%
Level 1: 80%+
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Adenosine, Guanosine, thymidine, uridine, cytidine are all ________ but adenylic acid, guanylic acid, uridylic acid, cytidylic acid are ______:
| 1. | Nucleotides, nucleosides |
| 2. | Nucleosides, nucleotides |
| 3. | Nucleotides, nucleic acids |
| 4. | Nucleotides, nucleases |
Subtopic: Nucleic Acid | The DNA |
82%
Level 1: 80%+
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