What enzyme unwinds a segment of the DNA molecule?          

Which of the following is NOT an example of positive feedback? 

The chemical properties of an atom are determined by the number of;

Energy can change forms, but cannot be created or destroyed is a statement of the; 

Semiconservative DNA replication means that each daughter DNA molecule is composed of one original strand and one new strand.

Match the class of enzyme with its function.    

Ribozymes are RNA molecules that act as; 

The folded inner membrane of a mitochondrion is called ;

 A molecule or atom ———–  during reduction;

Adjacent water molecules are attracted by the weak ——– bonds;