basic process of photosynthesis: sunlightsunlight
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Basic Process of Photosynthesis:
Sun
LIGHT
Basic Process of Photosynthesis:
H2O CO2
Light Dependent Reactions
Calvin Cycle
O2 Sugars
CHRLORPLAST
Sun
LIGHT
Chemical Pathways• Living things get the energy
they need from food
• Both plant & animal cells carry out final stages of cellular respiration
…Remember “ATP”?
• ATP stores energy for cell activities like active transport & movement within the cell
EQUATION FOR
CELLULAR RESPIRATION
EQUATION FOR
CELLULAR RESPIRATION
Cellular Respiration…• Process that releases energy by
breaking down glucose & other food molecules in the presence of oxygen
• Three Stages:1. Glycolysis2. Krebs Cycle3. Electron Transport Chain
GLYCOLYSIS• Breaks down “Glucose” (6-carbon sugar) into
2 molecules of “Pyruvic Acid” (3-carbon compound)
• The products are:– 2 Pyruvic Acid molecules– 2 ATP molecules– 2 NADH molecules
Glycolysis has 2 pathways…
1. If Oxygen is present (Aerobic) ...“Krebs Cycle”… then to Electron Transport Chain
2. If Oxygen is absent (Anaerobic) … “Fermentation”… (directly to Electron Transport Chain)
FERMENTATION(Aanerobic Pathway)
2 TYPES: Alcoholic & Lactic Acid
1. Alcoholic :• Yeast & other microorganisms use this to
produce alcohol & CO2 as wastes.
• Beer is a beverage made by alcoholic fermentation
2. Lactic Acid:– Exercise causes the body needs
more oxygen for respiration to make more ATP
– Body resorts to lactic acid fermentation to make ATP
– Lactic Acid is also produced causing burning sensation in muscles
FERMENTATION(Aanerobic Pathway)
Glycolysis has 2 pathways…
1. If Oxygen is present (Aerobic) ...“Krebs Cycle”… then to Electron Transport Chain
2. If Oxygen is absent (Anaerobic) … “Fermentation”… (directly to Electron Transport Chain)
KREBS CYCLE(Aerobic Pathway)
• Pyruvic Acid is broken down into CO2 in a series of energy extracting reactions
Hans Kreb:• SEE P.226• Discovered
citric acid cycle, “Krebs Cycle”
ELECTRON TRANSPORT CHAIN
• Uses high energy electrons from the Krebs Cycle to convert ADP to ATP!!!
• O2 is the final electron acceptor in the electron transport chain
Cellular Respiration…
• Process that releases energy by breaking down glucose & other food molecules in the presence of oxygen
• Glycolysis sets
the stage for
Cellular RespirationTwo Stages:
1. Krebs Cycle2. Electron Transport Chain
Cellular RespirationMini-Lab
• Clear your desk (except for pencil or pen)
• Write the title above on notebook paper• Complete the Mini-lab (procedures & observations)
• Answer the questions on both sides• Turn-in work to class basket when you
finish (we will discuss it in class)
You Have 15 min.!!!
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