form 4 chapter 4 - chemical composition of cell
Post on 14-Apr-2017
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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 )
Nucleic Acid C H O N P
NUCLEIC ACID
TEST PRESENCE OF STARCH ? Iodine solution ! Changes from brown to blue black if starch is present..
Nucleic Acid C H O N P
ESTER BONDS
CONDENSATION
Phospholipid bilayer forms basis of all cell membranes with its hydrophilic properties
COOH ! Carboxylic acid
NH2 Amine group
Available in human body
LINEAR SEQUENCE of amino acid
Example : INSULIN
FOLDEDTWISTED
Eg : DNA / RNA, keratin.
Eg : MYOGLOBIN ( in muscles ) , Antibody and Hormones.
Ionic, disulphide, hydrogen bonding.
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