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Read the following four statements (A-D) about certain mistakes in two of them: (A) The first transgenic buffalo, Rosie produced milk which was human alpha-lactalbumin enriched. (B) Restriction enzymes are used in isolation of DNA from other macro-molecules. (C) Downstream processing is one of the steps of r-DNA technology. (D) Disarmed pathogen vectors are also used in transfer of r-DNA into the host. Which are the two statements having mistakes?

1. Statement (B) and (C)
2. Statement (C) and (D)
3. Statement (A) and (C)
4. Statement (A) and (B)

Correct answer: Statement (A) and (B)

Solution

Rosie was the first transgenic cow, not buffalo, so statement (A) is incorrect. Restriction enzymes are used to cut DNA, while isolation from other macromolecules is done by other purification steps, so statement (B) is also incorrect.

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