Photosynthesis basics

Interrelationship between Photosynthesis & Resp.

Photosynthesis equation

Where does photosynthesis take place?

Chloroplasts

Structure of chloroplasts

Chloroplast outer membrane

• Permeable to range of ions & small molecules

• Evidence of endosymbiosis

Chloroplast inner membrane space

• Contains transport proteins

  • Controls flow of molecules between stroma & cytosol

• Double membrane evidence of endosymbiosis

Stroma

• Has appropriate enzymes & pH for Calvin Cycle

• CO2, sugars, enzymes, & other molecules dissolved in here

• Where light independent reactions occur

• Contains 70s ribosomes

• Surrounds grana, transport of products from LDR into stroma = rapid

Thylakoids

• Has ETC & ATP synthase for photophosphorylation

• Flattened, folded membrane = high SA

• Holds chlorophyll + other pigments

• LDR occurs on its membranes of the grana

Lamellae

Membranous channels that connect & separate grana

Grana

Stacks of thylakoids

• Creates large SA allowing maximum absorption of light

• Provides more membrane space for ETCs & ATP synthase

Lumen

Spaces inside thylakoid

DNA

• Loop of DNA codes for some chloroplast proteins

• Produced at 70s ribosome

• Contains genes that code for some proteins & enzymes used in photosynthesis