BIOLOGY G10 UNIT 3 BIOCHEMICAL MOLECULES

Book Description

1. Inorganic molecules do not contain carbon and were not created through biological means except oxides (CO2, CO) and carbonate ions (HCO3 , NaCO3). • • • • • do not contain both carbon and hydrogen simultaneously (contain either hydrogen or carbon). Many inorganic compounds include hydrogen atoms EX.

H2O and HCl Only a few inorganic compounds contain carbon atoms. One of such examples is carbon dioxide (CO2). 2.

Organic molecules are made up of both carbon and hydrogen atoms. • Covalent bonds are used to make organic compounds in living creatures, including the human body.  in your body • • Carbon are the second most abundant element Hydrogen is the third most abundant element. 3.1.1 Inorganic molecule: Water e properties of water • • • • • • • • Water is composed of two elements: hydrogen and oxygen. H2O is its chemical formula. composed of two hydrogen atoms linked to a single oxygen atom. Life would not exist on our planet if it did not have access to water. 70 to 95 percent of the cells mass. You are around 60% water. Water covers three -quarters of the planet and on the remaining one-quarter, which is land,  Th Water is a polar molecule: because of unequal sharing of electrons between H & O. • This unequal electron sharing creates two electric dipoles in the water molecule  O2 bears partial –ve charge and H bears partial +ve charge .

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