DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of Baking flour (all purpose) containing starch grains. All purpose baking flour contains wheat and barley flour (ground wheat and barley seeds). Starch is a polysaccharide that has two basic components amylose and amylopectin. Amylose is an unbranched chain of glucose molecules which is coiled in the shape of a helix. Starch is made by plants to store energy and is used when needed by the plant (e.g., when a seed germinates). Magnification: x100 when shortest axis printed at 25 millimetres.
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