Question

Question 8 2 pts How do certain bacteria always degrade "foreign" DNA when they are introduced to it? s. These enzymes function to restrict the transfer of DNA between strains Bacteria utilize restriction enzymes. These enzymes function to restrict the tr of bacteria. Bacteria utilize restriction enzymes. therefore degrading it. These enzymes function to restrict the foreign DNA's ability to move, enzymes. These enzymes function to restrict translation triction enzymes. These enzymes function to restrict movement of the infected bacteria These enzymes function to restrict the amount of foreign DNA that is OBacteria utilize restriction enzymes. able to infect them

Answer 1

Restriction enzymes were originally discovered in the 1960s in bacteria. They are crucial to DNA study and the creation of recombinant DNA because they can cut the DNA strand at specific nucleotide base sites. For example, a DNA sequence 5'-GTGAATTCTA-3 contains a palindromic recognition sequence for a restriction enzyme called EcoRI. This enzyme recognizes the sequence "GAATTC" and produces cohesive end DNA fragments Bacteria defend from restriction enzymes by protective methylation of target sequences For both strands to be methylated, the sequence must be palindromic. This mechanism is called the restriction-modification system. Undermethylated conditions, the restriction enzymes cannot breakdown the bacterial DNA. When the viral DNA entered into a bacterial system, it would be in an unmethylated condition. So, the restriction enzymes digest the viral DNA and won't allow it to be incorporated into the bacterial genome for Replication. Therefore, the correct option is Bacteria utilize restriction enzymes. These enzymes function to restrict the foreign DNA's ability to move, therefore degrading it.