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Learn Biology: Cells—Chloroplasts

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Uploaded on Feb 11, 2011

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Mahalo biology expert Mary Poffenroth tells you about the chloroplasts found in photosynthetic organisms.

Chloroplasts
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Most of the living world runs on the energy provided by the sun. The transfer from solar to chemical energy happens through photosynthesis, which occurs in the organelle called chloroplast.
Past the outer membrane you will find that the chloroplast is filled with a thick fluid called "stroma." Within the stroma are large stacks called thylakoids, arranged in granum. Think of the granum as a stack of pancakes. These thylakoids are where photosynthesis takes place.
http://www.youtube.com/watch?v=y8_G9o...  

Antennae Complexes
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Embedded in the thylakoid membrane are antennae complexes which consist of pigments like chlorophyll and carotenoids, plus proteins that help bind the pigments together. They increase surface area and wavelength range the pigments can absorb.http://www.youtube.com/watch?v=y8_G9o... 

DNA
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Both mitochondria and chloroplasts have their own DNA, completely separate from the cell. This shows evolutionary evidence that each were free-living forms in the very distant past.http://www.youtube.com/watch?v=y8_G9o... 

Read more by visiting our page at:
http://www.mahalo.com/chloroplasts/

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