Mitochondria transfer chemical energy from food to ATP; chloroplasts transform light energy into the chemical energy of ATP. <span>Mitochondria and chloroplasts are capable for converting chemical energy<span> from food (or light) in the cell to energy in a form usable to that cell (ATP).</span></span> <span>High-energy electrons which are produced during the oxidation of food molecules (or from the action of sunlight in case of chloroplast) are transferred through the electron transport chain located in the inner membrane of mitochondria. These electron transfers release energy that is used to pump H+ and thus generate an electrochemical proton gradient. H+ moves down its electrochemical gradient through a protein called ATP synthase permitting the proton gradient to drive the production of ATP.</span>
Proteins can be catalysts which help to reduce the energy used in a chemical reaction or speed it up. Proteins can help carry oxygen throughout the body in the form of hemoglobin
According to ChaCha.com, "Parthenogenesis is a form of agamogenesis in which an unfertilized egg develops into a new individual. Parthenogenesis occurs naturally in many plants and invertebrates. This differs from other forms of asexual reproduction because an egg is used."
