Lesson Flashcards: The Light-Dependent Reactions Biology

ATP synthase

An enzyme that synthesizes ATP using the energy generated by the movement of hydrogen ions through it across the mitochondrial or thylakoid’s membrane

Photosystems

A multiunit complex of organic molecules, proteins, and photosynthetic pigments like chlorophyll found in the thylakoid membranes that capture and harvest light energy

Photophosphorylation

The process of generating ATP from ADP and an inorganic phosphate using energy provided by light

Electrochemical gradient

A gradient caused by the difference in charge and concentration of ions across a membrane

Chlorophyll

A green pigment found in the chloroplasts of plants that absorbs the light energy required for photosynthesis

Diffusion

The movement of molecules from a region of high concentration to a region of low concentration

Phosphorylation

A biochemical reaction that involves the addition of a phosphate group to an organic compound

Thylakoids

Membrane-bound disklike compartments that are suspended in the stroma of chloroplasts and form stacks of around 15 or more disks

ATP (adenosine triphosphate)

An energy-carrying molecule that is found in all living cells

Chemiosmosis

The movement of hydrogen ions across a membrane down their electrochemical gradient in light-dependent reactions

Photolysis

The breakdown of a molecule using light energy

Photosynthesis

The process that converts carbon dioxide and water into sugars, such as glucose, and oxygen in the presence of sunlight

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