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Greetings. Welcome to Lecture 19 in our Principles of Biochemistry lecture series.
I'm Jerry Feigenson, a professor in
the Department of Molecular Biology and Genetics at Cornell University in the USA.
In the previous lecture, lecture number 18,
you saw how amino acids break down to form nitrogen free useful fuel molecules.
In mammals, the various fuels that we eat create a gradient of protons and
voltage across the inner mitochondrial membrane
by means of four different protein complexes.
Then, the ATP synthase enzyme uses
these gradients to drive synthesis of ATP from ADP and phosphate.
In this 19th lecture,
you will learn some of the basics of chloroplast structure relevant to photosynthesis,
and we will see what are
the possible four fates for energy in general after light is absorbed.
We will see the roles of chlorophyll and other photosynthetic pigments,
and we will spend most of the time looking at
events in the photosynthetic reaction centers,
which create a proton gradient across the thylakoid membrane.
Then at the end,
we will summarize how the strong reducing power created by
light absorption can be simply summarized in what's called the Z scheme.