BIOL 1090 Lecture Notes - Lecture 8: Signal Peptide, Cellular Respiration, Cytosol
Biology 1090 Lecture 8
• Mitochondria: ATP synthesis
• Plastids: Photosynthesis, ATP synthesis
• Peroxisome: Detoxification
Photosynthesis
Plastids
• Based on colour
o Leucoplasts
o Chloroplasts
o Chromoplasts
• Both shape and function can differ and different types are interconveritble
• Plastid stroma- filled extensions are called stromules
• Plastids are motile
• Produce dynamic extensions
• Contain own DNA
• Prokaryotic ribosomes
• Outer membrane contains porins
• Inner membrane- impermeable
• Thylakoids: Photosynthetic machinery on a system of flattened membrane sacs
• Grana: stacks of thylakoids
• Lumen: Space inside thylakoid
• Stroma: outside the thylakoid but inside the inner envelope
o Stroma contains proteins responsible for carbohydrate synthesis
Harvesting Light
• Several hundred Chl molecules act together as one PHOTOSYNTHETIC UNIT
• The Antenna system harvests light of various wavelengths and transfers excitation energy to the rxn center
• Photosynthesis consist of light dependent and light independent (dark) reactions