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Unformatted text preview: electrons from one carrier to another. As a result of gaining an electron (reduction), the first carrier of the electron transport system gains energy. It uses some of the energy to pump H + into the thylakoid. The carrier then passes the electron to the next carrier. Because it used some energy to pump H + , it has less energy (reducing capability) to pass to the next H + pump. This carrier uses some of the remainder of the energy to pump more H + into the thylakoid. The electron is passed to the next carrier which also pumps H + . The electron transport system functions to create a concentration gradient of H + inside the thylakoid. The concentration gradient of H + is used to synthesize ATP. ATP is produced from ADP and P i when hydrogen ions pass out of the thylakoid through ATP synthase . This method of synthesizing ATP by using a H+ gradient in the thylakoid is called photophosphorylation ....
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- Fall '10