What act as molecular scissors to cut DNA at specific locations?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

What act as molecular scissors to cut DNA at specific locations?

Explanation:
Restriction enzymes act as molecular scissors by recognizing short, specific DNA sequences and cleaving the DNA at those sites. They are restriction endonucleases from bacteria that scan DNA for particular, often palindromic, sequences and cut within or near them. The cuts can be blunt or produce sticky ends with overhangs, which helps when joining DNA fragments in cloning or genetic analysis. DNA ligase, on the other hand, seals breaks in DNA by forming phosphodiester bonds to join fragments. DNA polymerase synthesizes new DNA strands based on a template during replication or amplification. Ribonuclease degrades RNA, not DNA.

Restriction enzymes act as molecular scissors by recognizing short, specific DNA sequences and cleaving the DNA at those sites. They are restriction endonucleases from bacteria that scan DNA for particular, often palindromic, sequences and cut within or near them. The cuts can be blunt or produce sticky ends with overhangs, which helps when joining DNA fragments in cloning or genetic analysis.

DNA ligase, on the other hand, seals breaks in DNA by forming phosphodiester bonds to join fragments. DNA polymerase synthesizes new DNA strands based on a template during replication or amplification. Ribonuclease degrades RNA, not DNA.

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