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Photosynthesis Notes
Biology Unit 05 Lesson 01
Chemosynthesis
 Chemosynthesis uses energy released from
chemical reactions to produce food for
organisms.
 Organisms that carry out chemosynthesis
are microbes (bacteria) that live far from
the Sun, such as deep on the ocean floor.
Which Organisms Carry Out
Photosynthesis?
 Autotrophs such as plants and some
protists
Photosynthesis
 Photosynthesis is the cellular process in
which autotrophs capture light
energy and convert it to chemical
energy (glucose) using carbon
dioxide and water.
Equation for Photosynthesis
 6CO2 + 6H2O + Light Energy  C6H12O6 + 6O2
 Carbon Dioxide + Water + Light Energy 
Glucose (sugar) + Oxygen
Reactants & Products
of Photosynthesis
REACTANTS
PRODUCTS
Carbon Dioxide
Glucose (sugar)
Water
Oxygen
Light Energy
Where Does Photosynthesis
Occur?
 Chloroplasts
 Contain chlorophyll in plant cells or autotrophs
Cellular respiration
 What is it?
 the process in which organisms acquire energy
from
food. (Release of chemical energy for cellular use.)
 The chemical equation for respiration is:
 C6H12O6 + 6O2
6CO2 + 6H2O
 Glucose + Oxygen Carbon Dioxide + Water
 Where does it occur?
 Starts in cytoplasm, finishes in Mitochondria, all cells
 TWO parts
 Glycolysis, respiration/fermentation
STEP 1: Glycolysis
Breaks the glucose into two 3-carbon
sugars called pyruvate
 STEP 2:
OR
 Respiration (aerobic)
 Fermentation (anaerobic)
 Krebs cycle + Electron
 Lactic acid (animals) or
 Breaks down pyruvate into
 Breaks down pyruvate into
 Produces 38 ATP molecules
 Produces 2 ATP molecules
Transport Chain
ATP using Oxygen
alcoholic (plants)
ATP without Oxygen
Reactants & Products
of Photosynthesis and respiration
REACTANTS
Phot
Resp
PRODUCTS
Light Dependent Reaction
 Occurs in the thylakoid
 Water is absorbed through roots.
 Sunlight enters the chloroplast, causing H2O
molecules to split.
 O2 leaves as a waste product through the
stomata.
 NADP+ picks up the H+ ions (becoming NADPH)
and moves them to the stroma for the light
independent reaction (Calvin cycle).
Light Independent Reaction –
Calvin Cycle
 Carbon dioxide from the atmosphere enters
 H+ breaks off from NADPH
 NADP+ returns to the Light Dependent
Reaction
 Carbon dioxide becomes “fixed” with the H+
producing the glucose molecule C6H12O6.