7. Which of the following enzymes acts on the DNA after its entry into the cell?
a) ligases
b) endonucleases
c) deoxyribonucleases
d) exonucleases
Answers
Answer:
Restriction enzyme, also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the molecule. In the bacterial cell, restriction enzymes cleave foreign DNA, thus eliminating infecting organisms.
Answer:
c) deoxyribonucleases
Explanation:
After DNA enters the cell, one strand is immediately degraded by deoxyribonuclease, and the other strand bases on the homologous portion of the chromosome of the recipient cell.
Deoxyribonuclease (DNase) enzymes perform a variety of important cellular functions by degrading DNA by hydrolyzing the phosphodiester skeleton. Deoxyribonuclease I (DNase I) enzymes cleave single- or double-stranded DNA and require divalent metal ions to hydrolyze the DNA, 3΄-hydroxyl and 5΄-phosphorylation products. To generate.
Deoxyribonuclease is a type of nuclease and is a general term for enzymes that can hydrolyze phosphodiester bonds that bind nucleotides.
DNase I is mainly produced by organs of the digestive system such as the pancreas and parotid glands.
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