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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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Heterochromatin differs from euchromatin in being:
| 1. | Densely packed and transcriptionally inactive |
| 2. | Lightly packed and rich in ribosomes |
| 3. | Site of active gene transcription |
| 4. | Composed entirely of RNA |
Subtopic: DNA Packaging |
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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 central dogma of molecular biology is:
| 1. | DNA → RNA → Protein | 2. | Protein → RNA → DNA |
| 3. | RNA → DNA → Protein | 4. | DNA → Protein → RNA |
Subtopic: The DNA |
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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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Identify the incorrect statement:
| 1. | Histones are a set of positively charged, basic proteins. |
| 2. | Histones are rich in the basic amino acid residues lysine and arginine. |
| 3. | Histones are organised to form a unit of eight molecules called histone octamer. |
| 4. | The positively charged DNA is wrapped around the positively charged histone octamer to form a structure called centrosome. |
Subtopic: DNA Packaging |
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