Biology I Mr. Hamer’s Hooligans

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Presentation transcript:

Biology I Mr. Hamer’s Hooligans Photosynthesis Biology I Mr. Hamer’s Hooligans

Overview All energy on earth comes from the sun. We depend on: Plants Algae (underwater plants) Cyanobacteria (photosynthetic bacteria) To provide this energy to us!

Overview

Overview Carbon dioxide and water are taken in by plants Plants absorb light energy and convert it to a usable form. ATP Energy is used to “fix” carbon dioxide into sugar molecules Chemical energy Sugar is converted to starch and stored for use by the plant, and by animals when they eat plants.

Chloroplasts Have TWO membranes A “bi-bilayer!” The inner membrane is called the thylakoid. The thylakoid is folded and looks like stacks of coins called granum (grana singular).

Chloroplasts Chlorophyll molecules are embedded in the thylakoid membrane Act like a light “antenna” These molecules can absorb sunlight energy.

Light (dependent)Reactions Happen ONLY in sunlight Hence they depend on light! Light is absorbed by chlorophyll molecules The energy generates molecules of ATP

Light Independent Reactions (formerly the “dark reactions”) Happen in sunlight, and in the dark. ATP generated by sunlight drives the Calvin Cycle. Monosaccharides are manufactured in the cycle. Monosaccharides are used to “build” polysaccharides

Overall Reaction What is the equation for photosynthesis? carbon dioxide + water  glucose + oxygen + energy 6CO2 + 6H2O  C6H12O6 + 6O2 + ATP

OVERVIEW Plants and other producers use energy from the sun to convert water and CO2 into high energy sugars and O2. In addition to water and CO2 photosynthesis requires light and chlorophyll.