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One day, there were four molecules. These four 

molecules were cousins whose names were Protein, 

Carbohydrates, Nucleic Acids, and Lipids. Protein was 

very strong and healthy and did well in breaking 

things down fast. Carbohydrates was known as Carbo 

and was very energetic and often got in trouble during 

class. Nucleic Acids was known as N.A. amongst his 

friends and often spent time organizing and storing 

books for short periods of time. And lastly, Lipids 

was very organized and stored materials much 

longer than N.A. These cousins went to school every 

day and loved to learn about science.

One day, however, the students were asked by their science 

teacher to present to the rest of the class about organic 

molecules and macromolecules. The teacher explained to 

the class that organic molecules are molecules found in 

living systems that are friendly to other molecules in the 

world. Protein, Carbo and N.A. were excited because they 

already knew that they would get to write about their 

families. Lipids wasn't as excited because he knew it would 

be a lot of work. The other cousins promised him that they 

could all work together to get the work done. So, Lipid 

decided that he could do the work after all.

After many days of hard work, Protein, Carbo, Lipids and N.A. were 

ready to share what they had learned to the class. The first person 

to speak was Protein. He told the class that proteins create 

enzymes which makes things move faster. Protein also told the class 

how the monomer, or basic building block, of proteins are amino 

acids. Monomers are different from polymers which are made of 

repeating patterns that form a big molecule. Protein said that he 

also learned that a macromolecule is a molecule with many atoms. He 

also told the class about amino acids, which are important 

materials for life that build up proteins and how amino acids use 

peptide bonds to form reactions between carboxyls, which is a 

carbon atom joined to a oxygen atom, and how a molecule of water is 

released. His teacher was highly impressed.

The next person to present was Carbo. Carbo told the class of how he 

interviewed his grandfather and how is grandfather taught him that 

carbohydrates are a source of energy for life. Carbo also learned that 

carbohydrates are made of hydrogen, oxygen and carbon  and how the 

monomer of carbohydrates are monosaccharides.

"What are man-o-sack-e-rides? asked Timmy."

" Well," said Protein, "Monosaccharides, pronounced mon·o·sac·cha·ride, are 

single sugar molecules that help us grow and live." "Some examples that 

use them are honey and sugar cane."

Protein also explained that polysaccharides are carbohydrates with many 

sugar molecules bonded together. An example of polysaccharides are 

starch which is used in tasty food like lasagna and spaghetti, cellulose for 

plants, and glycogen which is used for people to move and store energy.

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