Bio Aa Final Document_v1

8/2/2019 Bio Aa Final Document_v1

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Lee Hui Min, Sarah Wong, Chang Jie Lin, Yap Lay Sheng, Goh Rui Zhe

Triglyceride

The diagram depicts an enlarged

ball and stick model of the triglyceride.

It depicts each atom in the molecule

using an approximation of the sizes of

the C, O, and H atoms. Also, the model is

done for a hydrocarbon tail of 12 carbon

atoms long. The main features of a

triglyceride molecule include the 1)

glycerol 2) 3 fatty acids/hydrocarbon

tails 3) Ester linkage between the

glycerol and the 3 fatty acids via a

condensation reaction.

The white tack represents the

carbon atoms; the blue tack represents

the oxygen atoms and the black tack

represents the hydrogen atoms. The

bends on the straws represent the kinks

formed in the hydrocarbon chain as a

result of the double bonds between two

carbon atoms. The paper clips

connecting the blue tack and the white

tack represents the ester linkage (o=c-o-

c) the double bond between the oxygen

and the carbon is also depicted.


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Phospholipid (Micro Illustration)

This is an enlarged model

of a single phospholipid molecule.

It depicts each atom in the

molecule (using an approximation

of the sizes of the C, O, H atoms,

along with the phosphate group).

The covalent bonds between each

atom are represented by a blue

straw, and the double bonds

represented by two blue straws.

A phospholipid consists of

one glycerol and two fatty acids

that are bonded together by two

ester linkages. The third OH of

glycerol is joined to a negatively

charged phosphate group by a

phosphoester linkage. Additonal

small molecules, represented by a

pink-coloured ball, can be linked to

the phosphate group to form a

variety of phospholipids, and

usually give rise to the hydrophilic

property of the phospholipids.

This is because the small molecule

is charged or polar itself. The

hydrocarbon tail contains 12

carbon atoms (the big red ball

representing carbon, while a much

smaller yellow ball represents

oxygen). The hydrocarbon tail of the model is saturated.


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Phospholipid Bilayer (Macro Illustration)

This model depicts a representation of a phopholipid bilayer. The hydrophilic heads of

the phospholipid layers are represented by sponges while the hydrophobic tails are represented

by toothpicks. Two distinct layer of liquids are shown, the hydrophilic head in contact with an

aqueous environment, while the hydrophobic tails in contact with oil in the non-polar interior of

the bilayer. A lipid bilayer is a two-dimensional sheet formed by the combination of two lipid

monolayers. The hydrophilic heads, facing outwards, are exposed to the polar surroundings, or

surrounding water, while the hydrophobic tails, facing inwards, are shielded from water in the

non-polar interior of the bilayer.

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Bio Aa Final Document_v1