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प्रश्न
Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?
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उत्तर
Retroviruses have RNA as genetic material. After the entry of a virus into the body of the host, the virus attacks the macrophage cells of the body where the RNA genome of the virus replicates to form viral DNA with the help of the reverse transcriptase enzyme.
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संबंधित प्रश्न
Define vector? write any two examples,
Identify the palindromic sequence which is recognized by the EcoRI restriction enzyme.
Identify the CORRECT sequence of steps in PCR.
______ is a Type I restriction enzyme.
Which of the following is not required in the preparation of a recombinant DNA molecule?
| Oil spill is a major environmental issue. It has been found that different strains of Pseudomonas bacteria have genes to break down the four major groups of hydrocarbons in oil. Trials are underway to use different biotechnological tools to incorporate these genes and create a genetically engineered strain of Pseudomonas - a ‘super-bug’, to break down the four major groups of hydrocarbons in oil. Such bacteria might be sprayed onto surfaces polluted with oil to clean thin films of oil. |
(a) List two advantages of using bacteria for such biotechnological studies?
(b) For amplification of the gene of interest PCR was carried out. The PCR was run with the help of polymerase which was functional only at a very low temperature. How will this impact the efficiency of the PCR? Justify.
(c) If such bacteria are sprayed on water bodies with oil spills, how will this have a positive or negative effect on the environment? Discuss.
Restriction enzymes were discovered by ______.
Plasmid is ______.
How does EcoRI differ from an exonuclease?
Name the enzymes that are called molecular scissors.
