The \beta -sheet rich structure of prion protein represents the
The-sheet rich structure of prion protein represents the
Select an option to attempt
Correct Answer: Option C
Explanation
DNase I (bovine pancreatic deoxyribonuclease I) is an endonuclease that makes single-stranded nicks in double-stranded DNA, but it also cleaves single-stranded DNA and RNA:DNA hybrids. The correct statement is that DNase I acts on BOTH single-stranded and double-stranded DNA — it does NOT cleave ONLY double-stranded DNA. The incorrect pair is therefore 'DNase I: Cleaves only double stranded DNA.' In contrast: Alkaline phosphatase correctly removes 5'-phosphates from DNA/RNA ends; DNA Pol I nick translation correctly: Pol I uses its 5'→3' exonuclease to remove the downstream fragment while its polymerase simultaneously synthesises replacement DNA in 5'→3' direction; RNA polymerase correctly performs transcription.