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DNA research - direction(e.g the'ascending strand and the...

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Types of Bonds in DNA The two strands are held together by Hydrogen bonds. These are much weaker than a covalent bond and form  between two molecules of opposite polarity. The two atoms, which are of positive and negative charge, are attracted  to each other. That attraction is what constitutes a Hydrogen bond.  Five prime and three prime ends (5' and 3' ends) - a double stranded DNA (the double helix) always has an  orientation or directionality. Because of this directionality, the nucleotides along one strand are heading in one 
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Unformatted text preview: direction (e.g. the 'ascending strand') and the others are heading the other (e.g. the 'descending strand'). For reasons of chemical nomenclature, the asymmetric termini of each strand are called the 5' and 3' ends (pronounced "five prime" and "three prime"). Nucleotide sequences are read by enzymes in the "5' to 3' direction". In a vertically oriented double helix, the 3' strand is said to be ascending while the 5' strand is said to be descending...
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