What activity occurred in the 37°C water bath during the digestion step?

What activity occurred in the 37°C water bath during the digestion step?

• A. DNA replication occurred
• B. RNA transcription occurred
• C. Enzyme was inactivated
• D. Restriction Enzymes were cutting the plasmid

Answer: (D)

During the digestion step, restriction enzymes are active and cut the plasmid DNA at their specific recognition sites. The 37°C water bath provides the optimal temperature for many restriction enzymes, allowing them to cleave the DNA efficiently. This is different from replication (which occurs in living cells with DNA polymerases) or transcription (RNA synthesis), both of which don’t happen in a simple in vitro digestion. Inactivation would stop the cutting activity, but the goal here is to have the enzyme function rather than be turned off. So the observed activity is restriction enzymes cutting the plasmid.

During the digestion step, restriction enzymes are active and cut the plasmid DNA at their specific recognition sites. The 37°C water bath provides the optimal temperature for many restriction enzymes, allowing them to cleave the DNA efficiently. This is different from replication (which occurs in living cells with DNA polymerases) or transcription (RNA synthesis), both of which don’t happen in a simple in vitro digestion. Inactivation would stop the cutting activity, but the goal here is to have the enzyme function rather than be turned off. So the observed activity is restriction enzymes cutting the plasmid.