In the CRISPR / Cas System of a Particular Bacterial

question 31

Multiple Choice

In the CRISPR / Cas system of a particular bacterial cell,it is noted that there are six spacer regions.What does this suggest about the bacterial cell?

• A)The cell has been infected by six viruses in the past.
• B)The cell has developed protection from six different viruses.
• C)The cell has six CAS genes due to past infections by viruses.
• D)The cell has been infected by six viruses in the past and now has developed a level of protection against all of them.