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What enzyme unwinds a segment of the DNA molecule?          

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

NAD+ and FAD+ are important examples of both coenzymes and electron carriers.

Organelles that contain enzymes for intracellular digestion and programmed cell death are known as _________.

What enzyme helps to form a second polynucleotide chain in each DNA that is complementary to the first?

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

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

Match the phase in the life cycle of the cell to what occurs during that phase.  

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

The bond between adjacent amino acids is a(n) __________.