Read the following four statements. (A) The first transgenic buffalo, Rosie, produced milk that was human alpha lactalbumin enriched. (B) Restriction enzymes are used in the isolation of DNA from other macromolecules. (C) Downstream processing is one of the steps of rDNA technology. (D) Disarmed pathogen vectors are also used in the transfer of rDNA into the host. Which of the two statements have mistakes?
Correct answer: D. A and B
- A. B and C
- B. C and D
- C. A and C
- D. A and B
Explanation
In 1997, the first transgenic cow, Rosie, produced human protein enriched milk. The milk contained the human alpha lactalbumin and was nutritionally a more balanced product for human babies than natural cowmilk. Isolation of DNA from other macromolecule is achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus).
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