Concept20 - Concept 7.5 Mitochondria and chloroplasts...

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Concept 7.5 Mitochondria and chloroplasts change energy from one form to another Mitochondria and chloroplasts are the organelles that convert energy to forms that cells can  use for work. Mitochondria  are the sites of cellular respiration, generating ATP from the catabolism of  sugars, fats, and other fuels in the presence of oxygen. Chloroplasts,  found in plants and algae, are the sites of photosynthesis. They convert solar energy to chemical energy and synthesize new organic compounds such as  sugars from CO 2  and H 2 O. Mitochondria and chloroplasts are not part of the endomembrane system. In contrast to organelles of the endomembrane system, each mitochondrion or chloroplast  has two membranes separating the innermost space from the cytosol. Their membrane proteins are not made by the ER, but rather by free ribosomes in the cytosol  and by ribosomes within the organelles themselves. Both organelles have small quantities of DNA that direct the synthesis of the polypeptides 
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Concept20 - Concept 7.5 Mitochondria and chloroplasts...

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