Question

Researchers noted that about half of all species of bacteria contain small segments of DNA of about 20–50 base pairs derived from plasmids or viruses. The phrase clustered regularly interspaced short palindromic repeats (CRISPR) describes the organization of these viral DNA segments in the bacterial genome. Bacteria use CRISPR to:

a. transcribe RNA that combines with a protein that has an RNA-cleaving function.
b. copy part of the bacterial genome and incorporate it into a viral genome.
c. "remember" the first time it was infected with a virus.
d. transcribe RNA that combines with a protein that has a DNA-cleaving function.
e. identify viral DNA by complementary base pairing with RNA.
f. identify viral DNA by complementary base pairing with template DNA.

Answer 1

The correct option is (c), (d), (e)

Step-by-step explanation:

• CRISPR is a technology which is used for editing genomes

• It helps the researchers to do change in the DNA sequences and modify the function of gene

• It corrects the genetic defects, improve crops and prevent the spread of disease

• These are the stretches of DNA

• The protein named Cas9 is an enzyme which acts like a pair of molecular scissors that are capable of cutting DNA strands

• The natural defense mechanisms of bacteria and archaea, give rise to the formation of CRISPR technology