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Read the following statements regarding the tools and processes of recombinant DNA technology: (A) The first recombinant DNA was constructed by linking an antibiotic resistance gene to a native plasmid of Escherichia coli. (B) Retroviruses, after being disarmed, are used to deliver desirable genes into animal cells. (C) The tumor-inducing (Ti) plasmid of Agrobacterium tumefaciens is modified to serve as a cloning vec

Options

  1. AOne
  2. BTwo
  3. CThree
  4. DFour

Correct answer

B. Two

Step-by-step solution

Statement (A) is incorrect because the first recombinant DNA was constructed by linking an antibiotic resistance gene with a native plasmid of Salmonella typhimurium, not Escherichia coli. Statement (B) is correct as disarmed retroviruses are used as cloning vectors to deliver desirable genes into animal cells. Statement (C) is correct because the Ti plasmid of Agrobacterium tumefaciens is disarmed and modified to serve as a cloning vector for plants. Statement (D) is incorrect because the denaturation of double-st

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