BIOL 1090 Lecture Notes - Lecture 8: Signal Peptide, Cellular Respiration, Cytosol

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15 Sep 2018

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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

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