Cells Use ATP For:
All other cellular reactions
Cells Have Enough ATP To Last For A Few Seconds
ATP must constantly be made
ATP Transfers Energy Very Well
ATP Is NOT Good At Energy Storage
Glucose is a monosaccharide
One Molecule of glucose Stores 90 Times More Chemical Energy Than One Molecule of ATP
History of Photosynthesis & Plant Pigments
Involves the Use Of light Energy to convert Water (H20) and Carbon Dioxide (CO2) into Oxygen (O2) and High Energy Carbohydrates (sugars, e.g. Glucose) & Starches
Many Scientists Have Contributed To Understanding Photosynthesis
Early Research Focused On The Overall Process
Later Researchers Investigated The Detailed Chemical Pathways
Several Centuries Ago, The Question Was: Does the increase in mass of a plant come from the air? The soil? The Water?
Planted a seed into A pre-measured amount of soil and watered for 5 years
Weighed Plant & Soil. Plant Was 75 kg, Soil The Same.
Concluded Mass Came From Water
Burned Candle In Bell Jar Until It Went Out.
Placed Sprig Of Mint In Bell Jar For A Few Days.
Candle Could Be Relit And Burn.
Concluded Plants Released Substance (O2) Necessary For burning.
Ingenhousz’s Experiment 1779
Repeated Priestly experiment with & without sunlight
Showed That Priestley’s Results Only Occurred In The Presence Of Sunlight.
Light Was Necessary For Plants To Produce The “Burning Gas” or oxygen