What is a Hydrogen Bond

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What is a Hydrogen Bond ?
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DNA Variability - FACTS

• Genes carry the instructions for cellular
  proteins.
• DNA is identical in all cells
• of an individual, almost identical
• among different individuals of
• same species (99.9), and very
• similar in related species
• (human vs chimpanzee 98 identity).
• Only 3 of cellular DNA has
• a known function !
• Variations in the code is the source for
  cellular differences.
• Disease and susceptibility to disease can be
  caused by changes
• in the DNA (mutations).

Human individuality
http//www.brc.dcs.gla.ac.uk/drg/seminars/bioinfo
rmatics/sld032.htm
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http//www.ornl.gov/hgmis/graphics/slides/images/0
0-0480.jpg
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Hereditary mutations Carried in the DNA of the
reproductive cells. The mutation will be
present in all of the offspring's body cells.
Acquired mutations Developed in the DNA during
a person's lifetime. If the mutation arises in
a body cell, copies of the mutation will exist
only in descendants of that particular cell.
http//www.accessexcellence.org/AE/AEPC/NIH/gene07
.html