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Tag Archives: Hydrogen Bonds

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Dna: Structure and Function

ScienceBy William Anderson (Schoolworkhelper Editorial Team)July 30, 20101 Comment

DNA or nucleic acid is a polymer of nucleotides.  A nucleotide consists of 3 molecules: a 5-carbon sugar (pentose)  either deoxyribose (in DNA) or ribose (in RNA) a phosphate attached at the #5 carbon of the sugar an organic or nitrogenous base – a nitrogen containing ring structure – attached at the #1 carbon of…

Unique Properties of Water

ScienceBy William Anderson (Schoolworkhelper Editorial Team)July 30, 20101 Comment

Water is a unique substance essential to life. It is the most abundant molecule in any cell. The human body is 55-78% composed of water. 1. Polar Molecule – A polar covalent bond is formed between oxygen and hydrogen. The oxygen atom is slightly negative and the hydrogen is slightly positive due to unequal sharing…

The Chemical Basis of Cells: Biochemistry

ScienceBy William Anderson (Schoolworkhelper Editorial Team)July 1, 2010Leave a comment

The atom is the basic unit of matter. Atoms bond to one another to form compounds. Bonds are formed by the sharing or transfer of electrons present in the atoms. Bonds between Atoms: Chemical Bonds Covalent compounds –      formed by the EQUAL sharing of electrons between atoms –      electrically neutral molecules (no “+” or “-“…

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