question_answer 34)

  What does H in 'd? and III refer to the enzyme Hind III?

Answer:

                  (i) The first letter 'H' indicates the genus of the organism from which the enzyme was isolated, H = genus Haemophilus. (ii) The fourth letter d indicates the particular strain used to produce the enzyme,d = strain Rd. (iii) The Roman numerals denoted the sequence in which the restriction endonudease enzyme from that particular genus, species and strain of bacteria have been isolated-Ill, i.e., third restriction endonudease to be isolated from this species.