Q. No.The advantage of using DNA polymerases from thermophilic organisms in PCR is that:
1.
the DNA polymerases of these bacteria are much faster than those from other organisms
2.
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands
3.
the DNA polymerases of these bacteria never make mistakes while replicating DNA
4.
all of the above
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Using recombinant DNA technology, genes from a donor cell can be implanted into a bacterium for DNA replication and protein synthesis. The kind of cell(s) that can be used as gene donors in this technology is/are:
1. Bacteria only
2. Either yeast or bacteria only
3. Eukaryotic cells only
4. Any kind of cell
A gene carried by recombinant DNA is cloned when:
1. Its host bacterium divides by binary fission
2. It is transcribed
3. It is fragmented by restriction enzymes
4. It is hybridized
A piece of nucleic acid used to find a gene, by forming a hybrid with it, is called a
1. Probe
2. Vector
3. Restriction sequence
4. Retrovirus
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In situ hybridization is used to :
| 1. | Remove mutations from a chromosome |
| 2. | Remove plasmids from a cell |
| 3. | Clone a gene |
| 4. | Locate a gene on a chromosome |
A bacterium adds methyl group to its DNA, by a process known as modification, in order to:
| 1. | Clone its DNA |
| 2. | Turn its genes on |
| 3. | Transcribe many genes simultaneously |
| 4. | Protect DNA from its own restriction enzymes |
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A fragment of DNA, cut by a restriction enzyme, forms bonds with other DNA molecules that have
1. Been fragmented by the same restriction enzyme
2. Sticky ends
3. Plasmid component
4. Attached methyl group
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Hybridization of mRNA with DNA can reveal which segment of the DNA are introns and which segment are exons. When the magnification is high enough to see the molecule, the introns appear as
1. Single stranded loops in a double stranded molecule
2. Separate fragments
3. Triple stranded nucleic acid molecules
4. Barr bodies
Which of the following primers would allow copying of the single-stranded DNA sequence 5' ATGCCTAGGTC?
| 1. | 5' TACGG | 2. | 5' CTGGA |
| 3. | 5' GACCT | 4. | 5' GGCAT |
DNA from a eukaryotic organism is digested with a restriction endonuclease and the resulting fragments are cloned into a plasmid vector. Bacteria transformed by these plasmids collectively contain all of the genes of the organism. This culture of bacteria is referred to as :
| 1. | restriction map | 2. | RFLP profile |
| 3. | F' factor | 4. | library |
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