Cell Processes
Photosynthesis and
Cellular Respiration
Metabolism
 Sum of all the chemical reactions in a cell
 Includes reactions that break down food to
get energy for the cell
 Includes reactions that take molecules and
build bigger compounds to help the cell
function
Producers
http://www.units.muohio.edu/dragonfly/itc/blackwal.gif
 What is a producer?
 An autotrophic organism
Autotrophic means the organism makes its
own food from raw materials
Example: plants
Plants make their own food (sugars aka
glucose, starch, cellulose aka
carbohydrates!)
Plants create their own energy by making
their own food
http://www.hawaiianmagic.net/images/plantsampler.jpeg
Cellular Process: Photosynthesis
 Carried out by producers (autotrophs)
 Inputs: carbon dioxide, water, energy from
the sun
 Outputs: glucose (sugar) and oxygen
 Chemical equation:
6 CO2 + 12 H2O + light energy --> C6H12O6 +
6 O2 + 6 H2O
Photosynthesis: photo = light; synthesis =
putting simple things together to make
something complex
Cellular Process: Photosynthesis
 Photosynthesis: the process a plant (or other
autotroph) goes through to convert sunlight and
raw materials into food (sugar) for the plant
Inputs
CO2
H2O
Sunlight
Green plant
(autotroph)
Outputs
Glucose
(C6H12O6)
O2
Consumers
 Organisms that get their food by eating
other organisms and raw materials
 Consumers are HETEROTROPHIC
organisms: they cannot make their own
food, they do not do the process of
photosynthesis
Cellular Process: Cellular
Respiration
 Plant
and animal cells do cellular
respiration to get energy from their food to
fuel all other cellular processes and
reactions
 Cellular respiration: series of reactions
that use oxygen to break down the energy
from
food
(glucose
and
other
macromolecules) to get energy for the cell
to use in other reactions and processes
Cellular Process: Cellular
Respiration
Inputs
Glucose
oxygen
Consumer
Outputs
Carbon dioxide
water
Energy (ATP)
Cellular Process: Cellular
Respiration
 Glucose + oxygen --> carbon dioxide +
water + ATP (energy for the cell)
C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O + ATP (energy)
http://www.eou.edu/chemweb/molmodel/images/h2ofc.gif
http://www.bristol.ac.uk/Depts/Chemistry/MOTM/atp/atp.gif
http://www.biology.lsu.edu/introbio/Link2/glucose.gif http://www.ebi.ac.uk/chebi/displayImage.do?defaultImage=true&imageIndex=0&chebiId=16526
Photosynthesis & Cellular
Respiration
 They are interrelated!
 Outputs (products) of photosynthesis are
the inputs (reactants) of cellular respiration
Inputs
CO2
Green plant
(autotroph)
Inputs
Outputs
Glucose
(C6H12O6)
H2O
O2
Consumer
Outputs
CO2
H2O
Sunlight
Energy (ATP)
Outputs of cellular respiration are the inputs of photosynthesis
Cellular Process: Cellular
Respiration
 Consumers undergo cellular respiration in
every cell 24/7
 Producers do the process of
photosynthesis only during sunlight hours
 Producers undergo cellular respiration at
night--> the sugar the plant made during
the day gets broken down at night to give
the plant cell energy to perform other
processes