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Transcript
Energy in
a Cell
Photosynthesis
Energy in a Cell
•Cell
processes
require
energy.
Energy in a Cell
• Examples of cell
processes: muscles
contracting,
cells growing,
brain thinking,
and cell
transport.
Energy in a Cell
• Cells get energy
from a special
molecule called
ATP
(Adenosine
Tri Phosphate).
Energy in a Cell
•When one of the
phosphate groups
is removed,
energy is
released.
Energy in a Cell
•ATP becomes
ADP
(Adenosine
Di
Phosphate).
Energy in a Cell
•This
reaction is
facilitated
by enzymes.
Energy in a Cell
•ATP acts like a
rechargeable
battery.
Photosynthesis
• Photosynthesis:
process in which
plants use light
energy to convert
CO2 and H2O into
sugar and O2.
Photosynthesis
•Photosynthesis
takes place in
the
chloroplast.
Photosynthesis
Photosynthesis
•Chloroplasts are
double membrane
organelles
that float
in the
cytoplasm.
Photosynthesis
•Inside are
numerous
flattened
sacs called
thylakoids.
Photosynthesis
•Thylakoids
contain the
chlorophyll.
Photosynthesis
•Stroma is the
dense
substance
that
surrounds
the
thylakoids.
Photosynthesis
•Photosynthesis
is divided
into two
separate
reactions.
Photosynthesis
•Light dependent
reaction takes
place in the
thylakoid;
requires
chlorophyll.
Photosynthesis
•H2O is split
and O2 is
released
and H+ ions
are formed.
Photosynthesis
•ATP is
made from
ADP.
Photosynthesis
• Light independent
reaction: uses energy
(ATP) from the
light dependent
reaction to form
sugars from CO2.
Photosynthesis
•Also called
the Calvin
Cycle.
Photosynthesis
•This
reaction
takes place
in the
stroma.