Q. No.The bases of RNA are the same as those of DNA with the exception that RNA contains
| 1. | cysteine instead of cytosine. |
| 2. | uracil instead of thymine. |
| 3. | cytosine instead of guanine. |
| 4. | uracil instead of adenine. |
Subtopic: DNA Double Helix |
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Which of the following strands of DNA would be the
complement strand to G-C-A-T-C-G?
| 1. | C-G-T-A-G-C | 2. | G-G-A-T-G-C |
| 3. | A-A-C-G-A-T | 4. | T-T-G-C-T-A |
Subtopic: The DNA | DNA Double Helix |
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The two complementary strands of the DNA double helix are held to one another by
| 1. | ionic bonds between deoxyribose molecules |
| 2. | ionic bonds between phosphate groups |
| 3. | covalent bonds between nucleotide bases |
| 4. | hydrogen bonds between nucleotide bases |
Subtopic: DNA Double Helix |
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In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :
| 1. | G 17%, A 16.5%,T32.5% |
| 2. | G 17%, A 33%,T 33% |
| 3. | G8.5%,A50%, T24.5% |
| 4. | G 34%,A 24.5%,T 24.5% |
Subtopic: DNA Double Helix |
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The base pairing in a double stranded DNA is correctly described as:
| 1. | Similar | 2. | Identical |
| 3. | Complementary | 4. | Synergistic |
Subtopic: DNA Double Helix |
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Salient features of the Watson and Crick model include:
| 1. | Single-stranded helix. |
| 2. | A-DNA structure. |
| 3. | Double helix with antiparallel strands. |
| 4. | Parallel strands. |
Subtopic: DNA Double Helix |
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The number of cytosine bases in a DNA molecule
| 1. | is equal to the number of uracil bases. |
| 2. | is equal to the number of guanine bases. |
| 3. | is equal to the number of adenine bases. |
| 4. | cannot be predicted. |
Subtopic: DNA Double Helix |
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In the DNA molecule
| 1. | The proportion of adenine in relation of thymine varies with the organism |
| 2. | There are two strands which run antiparallel one in 5’ → 3’ direction and other in 3’ → 5’ |
| 3. | The total amount of purine nucleotides and pyrimidine nucleotides is not run always equal |
| 4. | There are two strands which run paralled in the 5’ → 3’ direction. |
Subtopic: DNA Double Helix |
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In DNA, the complementary base pairing involves:
| 1. | Adenine pairing with cytosine and guanine pairing with thymine. |
| 2. | Adenine pairing with thymine via two hydrogen bonds and guanine pairing with cytosine via three hydrogen bonds. |
| 3. | Thymine pairing with cytosine and adenine pairing with guanine. |
| 4. | Purines pairing with purines and pyrimidines pairing with pyrimidines. |
Subtopic: DNA Double Helix |
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Which of the following statements about DNA structure is incorrect?
| 1. | The two strands of DNA are held together by hydrogen bonds between complementary bases. |
| 2. | Adenine pairs with Cytosine through three hydrogen bonds, while Guanine pairs with Thymine through two hydrogen bonds. |
| 3. | The two strands of DNA are antiparallel, meaning one strand runs in the 5’→3’ direction and the other in the 3’→5’ direction. |
| 4. | The sugar-phosphate backbone forms the structural framework of DNA, with bases projecting inside. |
Subtopic: DNA Double Helix |
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