Molecules in food contains chemical energy that cells use to produce MORE CELLS. This energy is gotten from the chemical bond energy in food molecules, which in this way serve as fuel for cells. The particles in food additionally give the atoms that animals need to develop new living matter.
The enzyme responsible for facilitating hydrogen bonding between nucleotides in a new DNA molecule is Polymerase.
What is different with retroviruses in reproduction is that they do not kill their hosts at first because they can still insert their own genome. This process is what is known the reverse transcription. This is done by different proteins.
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