Defective DNA repair enzymes can produce tumors. B) Unregulated transcription fa

Question

Defective DNA repair enzymes can produce tumors. B) Unregulated transcription factors can produce tumors. C) A normal Ras protein produces tumors. D) Mutations in p53 prevent apoptosis. Which of the following is FALSE? A) Modified retroviruses can be used to introduce genes into humans. B) DNA chips can carry sequences from over 1000 genes on one chip. C) It currently takes years to sequence a human genome. D) ASO's can be used to test for inherited disease. Transgenic plants: A) are cultivated in the USA B) can be made using Ti plasmid and plant tissue culture C) may be resistant to insect pests D) all the above are true The restriction endonucleases used in recombinant DNA work: A) MAY produce sticky ends B) recognize sequences 14-16 bp long C) cut the DNA 15 bp away from the recognition sequence D) all the above Which of the following is TRUE about current Sanger dideoxy DNA sequencing procedures? A) Chain termination occurs during synthesis of a new DNA

Explanation / Answer

41.The correct answer is option (c).

c) It currently takes years to sequence a human genome.

The statements., A modified retrovirus can be used to introduce genes into humans and DNA chips can carry sequences from over 1000 genes on one chip are true.. ASO,s are used to test any gentical diseases. Hence, option D is also correct. The statement It currently takes years to sequence a human genome is false because human genome is already sequenced and many techniques are available to sequence the human genome. Therefore, currently it does not take years to sequence a human genome.

42. The correct answer is option (d)

d) all the above are true

The transgenic plants are used in the agriculture. The first genetically modified plant is approved for sale in U.S. It was estimated that 70-75% of the processed foods contained a GM ingredient in 2003. The transgenic plants can be made using Ti plasmid and plant tissue culture .They food crops produced through genetic engineering are mostly resistant to the pests, diseases, environment conditions, etc.

43).The correct answer is option (b).

Most of the restriction endonucleases recognise a DNA sequence of length of 4-8 bp in length.

44) the correct answer is option (b)

b) A radioactive label is always used

45) The correct answer is option (d) all the above

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