Botany
Which of the following is/are incorrect statement/s?
(I) DNA fragments are negatively charged.
(II) A gene whose expression helps to identify transformed cells is known as selectable marker.
(III) Exonuclease enzyme always cuts the DNA within the specific positions of dsDNA.
(IV) Bacteria can protect themselves from viruses by fragmenting viral DNA with the help of endonucleases.
Text Solution
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Botany
DNA fragments are negatively charged due to phosphate backbone. Selectable marker is the gene used to identify transformed cells e.g., antibiotic resistance genes.
• Exonucleases always remove nucleotides from the ends of dsDNA.
• Endonucleases cut DNA within specific sites.
Bacteria can protect themselves from viruses by endonucleases (restriction enzymes)
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