Q. No.The functions of the telomeres include:
I:
They prevent chromosomes from fusing with each other.
II:
They prevent chromosomes from shrinking due to DNA loss during replication.
III:
They allow chromosomes to segregate properly during cell division.
1.
I and II only
2.
I and III only
3.
II and III only
4.
I, II, and III
The two strains, R and S, of the bacterium Streptococcus pneumoniae, differ as:
| 1. | Rough bacteria can evade the immune system of a mouse. |
| 2. | Rough bacteria do not have most genes present in smooth bacteria. |
| 3. | Smooth bacteria do not have most genes present in rough bacteria. |
| 4. | Smooth bacteria are able to synthesize a polysaccharide capsule. |
Packaging of DNA ensures:
| 1. | Very long molecules of DNA can be packed into a small space. |
| 2. | Information within DNA is made available to drive cellular functions. |
| 3. | Information within DNA is modified from generation to generation. |
| 4. | All genes are transcribed. |
Deoxyribonucleotides in a ds DNA are held by:
I. Phosphodiester.
II. Hydrogen.
III. Ionic.
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Griffith's experiment discovered bacterial transformation which in his experiment means:
| 1. | A mutation in the R strain made them virulent. |
| 2. | A mutation in the S strain made them non-virulent. |
| 3. | A rough strain passed genetic information to a smooth strain. |
| 4. | A smooth strain passed genetic information to a rough strain. |
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.
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 |
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