Ch_322b_22.02

Ch_322b_22.02 - Carbohydrates in Nature Carbohydrates are...

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Carbohydrates in Nature Carbohydrates are the most abundant class of naturally occurring organic compounds, representing more than 50% of the dry weight of the biomass of Earth. They are found in all living systems: animals, plants, bacteria and other single-celled organisms. D-Glucose (an aldohexose) is oxidized by enzymes in the first step of a process that produces energy at the cellular level: C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + Energy glucose Excess glucose is stored in animals as a polymer called glycogen . Plants convert excess glucose into a polymer called starch . A third polymer of glucose is cellulose , a structural material in plants.
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Photosynthesis Glucose and other carbohydrates are synthesized in green plants and multi-cellular blue-green algae by a process called photosynthesis . In photosynthesis, light from the sun is the energy source that converts the more stable molecules of CO 2 and H 2 O into the more-energy-rich carbohydrates. 6 CO
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Ch_322b_22.02 - Carbohydrates in Nature Carbohydrates are...

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