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Satellite DNA is useful tool in 

  • Organ transplantation

  • sex determination

  • forensic science

  • forensic science


C.

forensic science

Britten and his coworkers (1996-68) have demonstrated that many vertebrate DNAs reassociate, especially, If broken into smaller pieces. This observation gave rise to the hypothesis that certain short sequences of bases are repeated hundred or more time in such DNAs. Such DNAs have been called repetitive or satellite DNAs have been called repetitive or satellite DNAs. All eukaryotes except years contain satellite DNA. Satellite DNA region like VNTR/RFLP are the basis of DNA fingerprinting (forensic science).

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Which of the following is used in gene cloning?

  • Nucleoids

  • Lomasomes

  • Mesosomes

  • Mesosomes


D.

Mesosomes

Plasmids are extrachromosomal genetic elements (DNA) found in bacterial cells. These can exist and replicate independently of the bacterial chromosome. Nowadays plasmids are widely used as vectors to produce recombinant DNA for gene cloning.

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Genetic engineering has been successfully used for producing

  • transgenic mice for testing safety to polio vaccine before use in humans

  • transgenic models for studying new treatments for certain cardiac diseases

  • transgenic cow -Rosie which produces high-fat milk for making ghee

  • transgenic cow -Rosie which produces high-fat milk for making ghee


A.

transgenic mice for testing safety to polio vaccine before use in humans

Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans. Transgenic mice are being used for testing toxicity of drugs. Transgenic animals are made that carry genes, which make them more sensitive animals. They are then exposed to the toxic substances and the effects studied. Toxicity testing in such animals will allow us to obtain results in less time.

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Which one of the following does not follow the central dogma of molecular biology?

  • Pea

  • Mucor

  • Chlamydomonas

  • Chlamydomonas


D.

Chlamydomonas

The central dogma a proteins synthesis is expressed as


Temin described the presence of an enzyme, ie, reverse transcriptase or RNA-dependent DNA polymerase, which controls the synthesis of DNA from a single strand of RNA. D-Baltimore also described the presence of this enzyme in RNA tumour viruses. The presence of this enzyme changed the central dogma of protein synthesis into central dogma reverse.

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Which of the following is used in gene cloning?

  • Nucleoids

  • Lomasomes

  • Mesosomes

  • Mesosomes


D.

Mesosomes

Plasmids are extrachromosomal genetic elements (DNA) found in bacterial cells. These can exist and replicate independently of the bacterial chromosome. Nowadays, plasmids are widely used as vectors to produce recombinant DNA for gene cloning.

326 Views

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