Q. No.All the following will not be applicable to DNA replication in prokaryotes except:
1. It begins at several places along the chromosome.
2. It begins at the origin and travels in both directions.
3. It begins at the origin and travels around the chromosome back to the origin.
4. It begins at a GC rich region of the chromosome.
1. It begins at several places along the chromosome.
2. It begins at the origin and travels in both directions.
3. It begins at the origin and travels around the chromosome back to the origin.
4. It begins at a GC rich region of the chromosome.
Avery, MacLeod, and McCarty used DNase in their experiment because:
| 1. | It enabled them to isolate pure DNA samples. |
| 2. | It enabled them to isolate pure protein samples. |
| 3. | This allowed them to demonstrate that removing the DNA prevents transformation. |
| 4. | It made sure that RNA will always be present when they attempted to transform the R strain. |
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The analysis of viral nucleic acid reveals that it contains adenine 21%, guanine 31%, cytosine 23%, and some unexpected base 19%. What will be true for this virus?
| I: | It probably uses RNA as its genetic material. |
| II: | The genetic material of this virus is probably single-stranded. |
| III: | Base pairing rules in this virus probably include adenine: cytosine. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
The bacterial DNA is mainly composed of:
1. Ori sequences.
2. Structural gene sequences.
3. Intergenic regions.
4. Introns.
All the following structures in a eukaryotic chromosome are composed of DNA except:
| 1. | Centromere | 2. | Ori |
| 3. | Kinetochore | 4. | Telomeres |
A genome will be best defined as:
1. All the information in plasmids of a bacterium.
2. A homologous pair of chromosomes.
3. The complete DNA sequences in a diploid zygote.
4. All the DNA contained in a human gamete.
When DNA is replicated the first nucleotides are added by:
1. DNA primase
2. DNA polymerase III
3. DNA polymerase II
4. DNA ligase
A deoxyribonucleotide contains:
| I: | Nitrogenous base. |
| II: | Deoxyribose sugar. |
| III: | Phosphate group. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Constitutive heterochromatin includes:
1. The Barr body.
2. A region of active gene expression.
3. Telomeres.
4. Both 1 and 2.
What key observation regarding Garrod'sinborn of metabolism leads to a landmark discovery in molecular biology?
| 1. | Identification of a defective gene in individuals with alkaptonuria. |
| 2. | Identification of a defective gene in parents of alkaptonuria patients. |
| 3. | Identification of a defective enzyme in individuals with alkaptonuria. |
| 4. | Identification of the inheritance pattern of alkaptonuria as autosomal recessive. |
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