Starch is:

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Starch is:

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The question at hand is: Starch is:
Option 1: 'Long chains of fructose' — This is incorrect. Fructose is a monosaccharide, a single sugar unit, not the polymer form. Starch is composed of glucose units, not fructose, so this choice misidentifies the monomer.
Option 2: 'Long chains of amino acids' — This is also incorrect. Long chains of amino acids form proteins, not starch. Starch is a carbohydrate, whereas amino acids are the building blocks of proteins, so mixing these concepts leads to confusion about biomolecule classes.
Option 3: 'Long chains of glucose' — This option aligns with the scientific definition of starch. Starch is a polysaccharide made by linking many glucose monomers, typically in branched (amylopectin) and unbranched (amylose) forms. The glycosidic bonds and repeated glucose units give starch its role as a storage carbohydrate in plants.
Option 4: 'Long chains of proteins' — This is incorrect for starch. Proteins are polymers of amino acids and have diverse structures and functions, whereas starch is a carbohydrate polymer of glucose. Confusing the polymer type leads to an inaccurate description of starch.
In summary, the distinguishing feature of starch is its composition as long chains (polymers) of glucose units, which drives its classification as a carbohydrate storage molecule in plants.

11:709:255:01 NUTRITION AND HEALTH Lecture Quiz 3 Carbohydrates S2025

Starch is:

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