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#Question id: 11008


Which of the following events is associated with the first heart sound?

#I Life Science/ Life Sciences Group – I-V
  1. Closing of the aortic valve
  2. Inrushing of blood into the ventricles during diastole
  3. Opening of the A-V valves
  4. Closing of the A-V valves

Answer:- Option(s): 4


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_______________ a bacterial enzyme, uses the energy of ATP hydrolysis to introduce negative supercoiling into DNA hence removing positive supercoiling generated during replication.

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