form 4 chapter 4 - chemical composition of cell

69
Because of the uneven distribution of electrons between hydrogen and oxygen atoms. This gives water molecule ‘ V-shape’. ( hydrogen bonding gives a strong cohesive forces )

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Page 1: Form 4 chapter 4 - chemical composition of cell

Because of the uneven distribution of electrons between hydrogen and oxygen atoms. This gives water molecule ‘ V-shape’. ( hydrogen bonding gives a strong cohesive forces )

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Nucleic Acid C H O N P

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NUCLEIC ACID

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TEST PRESENCE OF STARCH ? Iodine solution ! Changes from brown to blue black if starch is present..

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Nucleic Acid C H O N P

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ESTER BONDS

CONDENSATION

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Phospholipid bilayer forms basis of all cell membranes with its hydrophilic properties

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COOH ! Carboxylic acid

NH2 Amine group

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Available in human body

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LINEAR SEQUENCE of amino acid

Example : INSULIN

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FOLDEDTWISTED

Eg : DNA / RNA, keratin.

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Eg : MYOGLOBIN ( in muscles ) , Antibody and Hormones.

Ionic, disulphide, hydrogen bonding.

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