Q. No.Which of the following statements does not hold true for restriction enzyme?
1.
It recognises a palindromic nucleotide sequence
2.
It is an endonuclease
3.
It is isolated from viruses
4.
It can produce the same kind of sticky ends in different DNA molecules
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Restriction endonucleases present in bacterial cells provide an advantage to the cell because these enzymes:
| 1. | can identify the mutated sequences on the chromosomal DNA and help in their repair |
| 2. | selectively bind to particular nucleotide sequences that may appear in viral DNA preventing its replication in the cell |
| 3. | can cut the plasmid DNA of the bacterial cell that allows them to recombine foreign DNA into their plasmid DNA |
| 4. | help the bacterium take up foreign DNA from their environment and combine it into their genome |
For the multiplication of any alien piece of DNA in an organism, it needs to be part of a chromosome that has a specific:
| 1. | Telomeric sequence | 2. | Multiple cloning sites |
| 3. | Ori | 4. | Selectable marker |
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The first type II restriction endonuclease whose functioning depended on a specific DNA nucleotide sequence was:
| 1. | EcoRI | 2. | HindII |
| 3. | SmaI | 4. | BamHI |
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The following palindrome is recognized by the restriction enzyme:
| 1. | BamHI | 2. | EcoRI |
| 3. | HindII | 4. | PstI |
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A method used only for transforming animal cells is:
| 1. | Biolistics | 2. | Microinjection |
| 3. | Use of virus | 4. | Agrobacterium mediation |
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Lysozyme should be used when isolating DNA in a pure form from:
| 1. | A bacterial cell | 2. | A fungal cell |
| 3. | A plant cell | 4. | An animal cell |
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In recombinant DNA experiments, a vector:
| 1. | carries DNA into a new cell |
| 2. | links together newly joined fragments of DN |
| 3. | makes millions of copies of a specific segment of DNA |
| 4. | separates fragments of DNA by their length and electrical charges |
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If any protein-encoding gene is expressed in a heterologous host, the protein formed is called:
| 1. | Recombinant protein | 2. | Native protein |
| 3. | Pro-protein | 4. | Exotic protein |
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