What is the chemical equation of photosynthesis? How is it ...

Science Starter #2
November 3, 2015

 What is the chemical equation
of photosynthesis?

 How is it related to cellular
respiration?

Notes 4.1:
Energy, Life, and

Photosynthesis

Chapter 6

Pg. 113-115

Cellular Energy

 Cells convert
carbohydrates into ATP
 ATP (adenosine
triphosphate):
molecule used to
carry chemical energy
 Carries energy in its
bonds

Cellular Energy, continued

 The energy from ATP can power
different kinds of work in the
cell.

(a) Mechanical work (b) Transport work (c) Chemical work
ATP
Low concentration of solute ADP + P

ADP + P

ATP ADP + P

Chlamydomonas ATP

Flagella Enzyme

Substrates Product

High concentration of solute

Figure 4.12

How does ATP Release
Energy?

 Energy is released when the last phosphate
group is removed (bond is broken).

 ATP becomes ADP

How does ADP become ATP?

 Carbohydrates and other foods consumed by the
body contain energy.

 When they are broken down, energy is released
and is used to reattach a phosphate to ADP,
turning it back into ATP.

 Occurs in the mitochondria

ATP is like a Rechargeable Battery

Organisms Obtain Energy in
One of Two Ways

Heterotrophs Autotrophs

Organisms that must Organism that creates
consume others for own energy source
(glucose) from
energy source nonliving source
(glucose)

Chemosynthesis Photosynthesis

Autotrophs

Chemosynthesis Photosynthesis

Process of Process of
converting inorganic converting light

substances into energy into
chemical energy. chemical energy.

PHOTOSYNTHESIS OVERVIEW

 CHLOROPLASTS

 Autotrophs – like plants have
organelles called
chloroplasts

 Chloroplasts carry out a
process called
photosynthesis

 Photo – light
 Synthesis – putting together

Chloroplasts

 Chloroplasts contain:

 Thylakoids
 Grana
 Stroma

Light and Pigments

 Chloroplasts contain
pigments

 Pigments: absorb light energy

 Different colored pigments
absorb different colors of
light

 chlorophylls - green
 Xanthophyll - yellow
 carotene – orange/red

Photosynthesis

 Goal:

 Capture energy from light
 Combine CO2 and H2O with ATP to make glucose

(C6H12O6)

Photosynthesis equation

 6CO2 + 6H2O ℎ C6H12O6 + 6O2

 Carbon Dioxide + Water ℎ Glucose + Oxygen