Multiple choice

Which of the following statements is not true regarding restriction enzymes?

  1. Inside a prokaryote, the restriction enzymes selectively cut up foreign DNA in a process called restriction.

  2. Restriction was first identified by Salvador Luria and Giuseppe Bertani in early 1950s.

  3. The restriction enzyme and the recognition sequence for Streptomyces albus are Sa-II and 5’ GTCGAC; 3’ CAGTCA respectively.

  4. The restriction enzymes studied by Arber and Meselson were type I restriction enzymes.

  5. Restriction endonuclease cuts DNA of bacteriophage in Escherichia coli.
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C Correct answer
Explanation

The restriction enzyme and the recognition sequence for bacteria-Streptomyces albus are Sa-II and 5’ GTCGAC; 3’ CAGCTG respectively. 

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