CHLOROPLAST
CHLOROPLAST
• What do you remember about
chloroplast?
• Membrane Bound
• Contain DNA
• Green (due to chlorophyll)
• Site of photosynthesis
• Endosymbiont theory
PLASTIDS
•
PLASTID
• Plant cell organelles that are involved in energy storage & synthesis of
metabolic materials
•
Leucoplast
• Colorless plastid involved in synthesis of starch, oil, and protein
•
Chromoplast
• Yellow to red plastid involved in manufacture of carotenoids.
•
Chloroplasts
• Green plastids that contain chlorophyll and and chlorophyll b. Chlorophyll
enables chloroplasts to absorb light energy needed for photosynthesis.
PLASTIDS CONTINUED
• The variety of plastids present (number and type) is influenced by the needs
of the cell.
• Environmental factors contribute to the needs of the cell
• What types of environmental factors would you guess effect the variety of
plastids present?
• How would they effect the variety of plastids present?
A LITTLE MORE ON ENDOSYMBIOTIC THEORY
• What do you remember?
• Chloroplasts exhibit prokaryotic
traits
• Circular DNA
• Reproduce by binary fission
PARTS OF A CHLOROPLAST
Grana
Stroma
Thylakoid
PARTS OF THE CHLOROPLAST
•
Thylakoid
• Flattened membrane sacs where the light reaction of photosynthesis takes place i
• Products of the light reaction are ATP and NADPH 2
•
Grana
• Stacks of Thylakoids
•
Stroma
• Space between the grana. Semi-fluid material that contains dissolved enzymes.
• Contains DNA, special ribosomes, and RNA
• Dark reaction of photosynthesis takes place in stroma
• CO2 is converted to glucose
Groups of four….be sure the diagram is present in your notes
DIAGRAM THE CHLOROPLAST. LABEL ALL
PARTS AND LIST THE FUNCTIONS
PIGMENT
• A substance that reflects lights of specific wavelengths and absorbs others
• You SEE the colors that are REFLECTED
• What color of light does chlorophyll reflect?
• GREEN
• What color of light do chromoplasts reflect?
• RED and ORANGE