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Chloroplast
By: Alyssa Mecca & Rachel Wargo
The Chloroplast
A plastid found in plant cells
Chloroplast is the organelle in which
photosynthesis takes place and contains green
chlorophyll
Surrounded by a double membrane with
water and enzymes on the inside, there is also
a third membrane
 Capture light energy to conserve free energy
in the form of ATP
Chloroplast v Mitochondria
 Chloroplast-the proton
gradient is generated
across the thylakoid
membrane and used to
drive ATP synthesis in the
stroma
 Mitochondria-electron
transport generates a
proton gradient across
the inner membrane,
which is then used to
drive ATP synthesis in the
matrix
Functions
 Thylakoid membrane forms a
network of flattened discs, which
are arranged in stacks called
grana
– light reactions cause the
thlyakoid to develop a high
concentration of hydrogen
ions, for the production of
ATP by the chloroplast
 Stroma houses DNA
 Proteins are encoded by genes
in the nucleus, with the
protein products transported
to the chloroplast
Disease
 Tobacco Mosaic Virus (TMV)
– the viral helicase protein
and a chloroplast protein
form a complex that is
recognized by a plant
immune receptor
– RNA virus that infects
tobacco plants, causes
characteristic patterns
such as mottling of dark
and green areas on the
leaves
– Stunts a plants growth but
does not cause death
Skinner Style Questions
1.)Chloroplast have the most in common with?
A.
B.
C.
D.
Mitochondria
Lysosome
Golgi bodies
Cytoplasm
A.
B.
C.
D.
a.Stroma
b. chlorophyll
c.Thylakoids
d. Granum
2.) Which of these are not part of the Chloroplasts’
structure.
Skinner Style Question Answers
• 1) A-mitochondria
• 2) B-chlorophyll