Which statement about starch is true?

Which statement about starch is true?

• A. It is a protein used for energy
• B. It is a polysaccharide used by plants as an energy reserve
• C. It is a lipid used for energy storage
• D. It is a monosaccharide carbohydrate

Answer: (B)

Starch is a plant energy reserve in the form of a carbohydrate called a polysaccharide. It’s built from many glucose units linked together in two main forms, amylose and amylopectin, which lets plants store energy efficiently in seeds, roots, and other tissues. Because starch is a polymer of glucose, it is not a monosaccharide. It’s not a protein, since proteins are made of amino acids, and it’s not a lipid, which are fats and fat-like molecules. In plants, starch is stored in plastids and can be broken down by enzymes to release glucose when energy is needed. In humans, starch is digested by amylases to provide a major dietary source of glucose, illustrating its role as a carbohydrate energy reserve.

Starch is a plant energy reserve in the form of a carbohydrate called a polysaccharide. It’s built from many glucose units linked together in two main forms, amylose and amylopectin, which lets plants store energy efficiently in seeds, roots, and other tissues. Because starch is a polymer of glucose, it is not a monosaccharide. It’s not a protein, since proteins are made of amino acids, and it’s not a lipid, which are fats and fat-like molecules. In plants, starch is stored in plastids and can be broken down by enzymes to release glucose when energy is needed. In humans, starch is digested by amylases to provide a major dietary source of glucose, illustrating its role as a carbohydrate energy reserve.