NEET Biology question
Which of the following statement is not true? I. DNA being a hydrophilic molecule cannot pass through cell membranes. II. Agrobacterium tumefaciens delivers a piece of DNA known as 'Z-DNA' in the Ti-plasmid which transforms normal plant cells into tumour cells to produce chemical against pathogens. III. Retrovirus, adenovirus, papillomavirus are also now used as cloning vectors in animals because of their ability to transform normal cells into cancerous cells. IV. In genetic engineering, DNA from different sources are cut with the same restriction enzymes so that both DNA fragments have the same kind of sticky ends.
Solution
Statements I and IV are accurate general facts and III broadly reflects the historical ability of these viruses to integrate into host genomes, whereas statement II is incorrect because
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