How would you make a starch molecule? What is the name of the bond formed between glucose molecules?
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To make a starch molecule, you would need to link glucose molecules together through a specific type of chemical bond. Starch is a polysaccharide, which means it is made up of numerous glucose units joined together. The bond formed between these glucose molecules in starch is called a glycosidic bond.
To create a starch molecule, you would start with individual glucose molecules. Each glucose molecule contains six carbon atoms, with five of them forming a ring structure. The sixth carbon in each glucose unit is free to bond with other glucose molecules.
To form a glycosidic bond, you'll need to remove a water molecule (dehydration synthesis) and join two glucose molecules together. One glucose molecule will provide an alcohol group (-OH) on its fourth carbon, while the other glucose molecule will have a free hydroxyl group (-OH) on its first carbon. These two groups will combine, releasing a water molecule, and forming a glycosidic bond.
By repeating this process multiple times, you can create longer starch molecules consisting of many glucose units linked together with glycosidic bonds. The specific arrangement and branching patterns of these glucose units will determine the type of starch molecule produced (e.g., amylose or amylopectin).