Question

Question 19 Restriction enzymes are naturally produced by and isolated from O bacteria. O bacteriophages. O human cells. O plant cells. non-human mammals.

Answer 1

Question 19

The right answer is the first option - bacteria.

Explanation :-

• Restriction enzymes are certain enzymes that are naturally present in bacterial cells. These enzymes have the unique property of cleaving the DNA molecules at certain sites or sequences.
• Bacteriophages are certain viruses that attack the bacterial cells. No, bacteriophages do not have restriction enzymes in them. In fact, when the bacteriophages attack the bacterial cells and insert their genetic material inside the bacterial cells, the bacterial cells protect themselves by using their restriction enzymes to cleave these genetic molecules. Therefore the second option is the wrong answer.
• Human cells quite obviously do not produce restriction enzymes and this is a widely known fact. Therefore, the third option is also incorrect.
• Plant cells are also incapable of naturally producing restriction enzymes. Therefore, the fourth option is again the erong option.
• Non human mammals cannot produce restriction enzymes. As a result the last option is also not a viable one. Therefore, the first option is the right answer.